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You may be looking for The Ark in Space or the titular ark.

The Ark was the sixth serial of season 3 of Doctor Who.

It was the first full serial for new companion, Dodo, who had appeared only briefly at the end of the previous story. It was also the first to take place in what was definitively humanity's far future and the first to depict the demise of Earth.

Behind the scenes, it was notable for its then-groundbreaking use of out-of-sequence recording. The final episode, "The Bomb", was the first in Doctor Who history to be recorded according to set availability and then edited into a proper sequence. (DCOM: "The Bomb") Director Michael Imison also notably achieved a number of special effects shots through the liberal use of forced perspective, something which hadn't been widely attempted in Doctor Who at the time. Imison's use of playback to indicate that the bridge computers and control consoles on the Ark were fully operational was also unusually sophisticated for the Hartnell era.

The Ark was also the first time a female writer was credited on the show, though the extent of Lesley Scott's contribution was rather small. (About Time 1) Michael Sheard and Roy Skelton had their first involvement in Doctor Who with this serial, with the former appearing five more times and the latter going on to voice the Dalek Emperor, the Cybermen and, briefly, K9.

The serial's structure was similar to that of The Keys of Marinus, in that the first two parts tell a sub-narrative all of its own, whilst the following two parts tell a second sub-narrative, incorporating elements that interconnect both into a continuous plot.


The Doctor and his companions Steven Taylor and Dodo Chaplet arrive some ten million years into the future, on board a generation starship which is carrying the last of humanity away from an Earth that is about to fall into the Sun. However, the cold that Dodo has could prove devastating to these future humans and their servants, the Monoids.


The Steel Sky (1)[]

As the TARDIS materialises in a tropical rainforest, a one-eyed alien watches it in curiosity. Dodo emerges and immediately sneezes before going out to explore. Steven follows after her, confused as to her bravery. Dodo seems convinced that she is in Whipsnade Zoo and points out a number of Earth creatures, such as a chameleon and other lizards, to back up her point. The Doctor seems to back up her point by saying that all readings say that this planet has similar conditions to Earth.

Elsewhere a court has met, populated by humans and the alien race, the Monoids. They are putting on trial a Guardian who put the whole of their civilisation at risk by inadvertently failing to check sealing valves correctly. Despite pleading from the Commander's daughter, Mellium, the Commander sentences the man to miniaturisation for 700 years, the lightest punishment he can impose. The man is led into a device that shrinks him down into a microcell on a glass slide, and carried away by defending counsel Manyak in a covering dish.

Back in the jungle, Dodo finds an elephant and uses this to prove that they must be on Earth, but the Doctor points out that all of these animals are not indigenous to the same area. He also points out other anomalies that he has discovered since their landing. One is that there is no sky, just a metal roof over them, and the other is that the ground is rumbling as if mechanised. All this time the Monoid still watches over them.

Back at civilisation Zentos, a sceptical young understudy to the Commander, receives information from one of the Monoids, who communicate through sign language, that there are intruders on the ship. When he feeds this back to the Commander he doubts it, but there is incontrovertible video proof. Zentos suggests they are immediately arrested and questioned. The Commander agrees to the questioning but says that they should be invited.

As the Doctor and his companions explore, they hear an alarm raised and discover that the Monoids are exploring the TARDIS. They rush into a nearby cave where they avoid detection, despite Dodo's sneezing almost giving them away. The Doctor berates her, but she explains she is coming down with a cold. Once the coast is clear, the Doctor and his companions go out and explore. As they mount the crest of a hill, they see a city off in the distance. The Doctor immediately knows where he is now and explains that they are on a giant spaceship. As he does they are immediately surrounded by small one-eyed alien figures.

The Doctor and his companions are led to the city where they are cross-examined hostilely by Zentos, whilst the Commander welcomes them with curiosity. The Commander explains that the Monoids are a peaceful breed of alien who came to Earth from their own planet which was dying. They helped the human race to build this ship to escape Earth, which was itself dying due to the solar flares that were engulfing the planet. The Monoids also taught the humans the miniaturisation process which allowed the whole human race to be transported to their destination, Refusis II, and brought back when they arrive in 700 years time. The Doctor suggests that this means they have travelled nearly 10 million years into Earth's history. The Commander allows the Doctor and his friends the run of the ship. Steven and Dodo are led away by Mirian to be shown a statue, whilst the Doctor is shown the technology of the ship. Zentos is still sceptical of the Doctor's story, suggesting that he may be a Refusian come to scupper the ship's progress to Refusis II.

Mirian shows Steven and Dodo the giant statue of a Homo Sapiens that they are constructing out of gregarian rock, but the tour is interrupted by another alarm. They return to the main deck of the ship and see a Monoid laid out on a gurney with a fever and illness. As they flock around the alien, the Commander also starts to complain of a severe fever and falls to the ground. Zentos overhears a conversation between the Doctor and Steven wherein he explains that this is down to Dodo's cold. The humans from the 57th segment of time have no resistance to diseases so even the common cold could kill them. Zentos rushes to a podium and claims that it is Dodo that has started to spread this disease. As he talks, the Monoid dies. The humans are in a fervour of excitement and shock, and the Doctor and his companions are arrested and led away.

The Plague (2)[]

The Doctor and his companions are locked away in a prison cell. Steven questions the Doctor as to whether they have ever contaminated anywhere else before in their travels. The Doctor admits that it is something that he has never considered before.

Back in the control room, Zentos is getting evermore panicked as more and more Monoids die whilst greater numbers of the human population are becoming ill. Rhos, the ship's doctor, confides to Mellium that he is at a loss for a cure for the Commander.

In the prison, the Doctor and his companions overhear the funeral of a Monoid — which other Monoids perform by ejecting their comrade's body into space. Zentos uses the funeral gathering to gain popular support for a trial of the Doctor and his companions. He employs Baccu to act as prosecutor whilst Manyak and Mellium will offer defence.

Mellium informs the Doctor via a video screen in the cell that one of his contingents will have to offer evidence in the trial. Steven offers himself as he is feeling hot and unwell in the cell. He is led into the control room where he continues to sweat and feel ever more under the weather as the trial continues. Baccu begins by accusing Steven and his friends of being Refusian and being sent to kill them. Steven denies this, but Zentos says that their own story of time travel is equally as hard to believe. Manyak offers a bargain to Zentos, saying that the only hope that the humans and the Monoids have is that the Doctor could cure them; however, Zentos is against this and riles the crowd up into saying this will help them spread the disease more quickly and efficiently. The Commander, who is watching these proceedings from his sick bed, agrees with Manyak's proposal. As the jury mull this over, a human informs the assembly that a human has died of the illness. Zentos uses this as ammunition to sway the jury's verdict, and they all automatically judge the Doctor and his companions as guilty. Zentos sentences them to ejection from the ship. As this verdict is read out, Steven collapses due to his worsening condition.

Steven is carried back to the cell, where the Doctor tries to argue his point with Zentos but has no effect. Zentos sends Baccu away to prepare the ejection, but the Commander orders Zentos, over a loudspeaker, that the Doctor should be freed and given the chance to cure the disease on the one exception: that Steven is used as a guinea pig first.

Mellium presents herself to the Doctor to help in any way possible. He orders her to keep everyone warm whilst sending Dodo back to the TARDIS to get his equipment. The Doctor orders Baccu and Manyak to begin a hunt for certain animal membranes that he can combine to form a vaccine for the common cold.

Later, when this has been extracted, the Doctor applies his vaccine to Steven before straight away applying it to the other humans, starting with the Commander.

Baccu and Manyak suspect that this may not work and that Zentos is ready to eject the Doctor if it doesn't.

After an hour Steven is showing no signs of improving. Eventually, he begins to writhe in pain before falling back limp and lifeless. Dodo is concerned that he is dead, but the Doctor states he is sleeping soundly with his fever cured. Dodo and the Doctor go out into the control room and receive congratulations for their efforts.

After everyone is better the Doctor and his companions are given a heroes' farewell led by the Commander and are escorted back to the TARDIS. The TARDIS dematerialises and, seemingly, materialises back in the same place again. The Doctor and his companions emerge, bemused by this. Their bemusement grows when they discover that there is no-one around on the ship. The travellers are stopped in their footsteps when they discover the statue fully built — but with the head of a Monoid.

The Return (3)[]

The Doctor deduces that 700 years have passed since they were last on the Ark and discovers that they are close to Refusis II. The Doctor discovers that the reason why there are no humans around, is because the ship is now piloted by an automatic guiding device; however, a quick scan of the ship shows that there are some signs of life. The Doctor observes humans serving under Monoid control. As they observe this, they are caught by a Monoid, who are now able to speak and identify themselves through numerics depending on their position on the ship. Two and his personal manservant Maharis lead the Doctor and his companions to One.

Before One allows the Doctor and his friends into the ship, he watches back footage from 700 years ago and watches the TARDIS dematerialise. He tells the Doctor that he should thank him as the long-term effects of the fever transmitted by Dodo sapped the morale of the humans and allowed the Monoids to take over. One informs the Doctor and his friends that they are to be imprisoned in the servant kitchens.

Two human servants, Venussa and Dassuk, talk of the rumoured arrival of the Doctor, a figure that Dassuk puts down to myth, but he is put on his place when the Doctor arrives in his kitchen. The Doctor begins to talk about how to liberate the humans from the Monoids. Steven suggests that they overpower one, but Dassuk says this has been tried before unsuccessfully.

Back in the Control Room, a Monoid grand council has been called. One informs the Monoids that they are close to Refusis II and that they will send down a party first to ensure its safety. He also informs the Monoids that the humans will not be accompanying them to their new home. After the meeting, One asks Two to fetch the Doctor and Dodo, who will make up the search party. As Two enters the kitchens, Steven and Dassuk try to overpower him but are interrupted by Three, who kills one of the humans to break up the melee. Two seizes the Doctor and Dodo and leads them away. Three informs Steven that he is being kept here as security.

The Doctor, Dodo, Two and a human called Yendom are placed on a launcher and transported down to Refusis II. The planet seems both hospitable and deserted, but as the party explores it, an invisible figure enters the launcher and begins to toy with the controls. In a conversation with Dodo, Two lets slip that the humans will not be joining the Monoids on Refusis II. An argument breaks out that is only stopped by the Doctor, who points out a castle that lies in the distance. On closer exploration, they discover the castle also appears deserted. Two picks up a vase from a table and smashes it on the floor, hoping that this will draw the attention of a Refusian. A disembodied voice calls for Two to stop, but he refuses — instead picking up another vase containing flowers from the table, throwing the flowers on the floor and getting ready to smash that vase too. Two is suddenly overpowered by an invisible figure, who then takes the vase from Two, puts it back on the table and replaces the flowers.

Back on the Ark, One explains his plan to some other Monoids. He says that as soon as they get to Refusis, he plans on blowing up the ship with a fission bomb placed inside the Monoid statue. Maharis sees this conversation over one of the video controls but isn't aware of where the bomb is. Maharis goes to the kitchen, where he is initially met with hostility due to the fact that he sided with the Monoids so as to avoid total servitude, but he explains to them the Monoid plan.

On Refusis II, the Doctor is mediating with the Refusian. The Refusian explains that the castle has been built for the Monoids, as they have no purpose for them anymore — they lost their physical form after a solar flare hit Refusis II. They will happily share their planet if the Monoids wish to live in peace.

Outside the castle, Two explains to Yendom that he is going to radio back to the Ark to explain the situation. Yendom lets Two know he's aware they aren't going to bring the humans and tries to overpower Two but is killed. Two gets into the launcher and begins to notify the Ark about how to destroy the Refusians. But unbeknownst to him, a Refusian is outside the ship and blows up the launcher, leaving the Doctor and Dodo stranded on Refusis II.

The Bomb (4)[]

The tension of the situation ferments dissent in the Monoid ranks, with Four openly opposing One's plans to abandon the humans and colonise Refusis without more checks on the planet. One is informed of this plot and says he will kill Four if the dissent becomes public.

Back on Refusis II, the Refusian explains to the Doctor and Dodo that the reason they blew up the launcher is because they've always known peace, never war or conflict. Dodo explains that the guardians, or humans, are like that, but the Doctor explains they could also be intolerant and selfish, and the Refusian confirms that this is why they were conquered by the Monoids. But Dodo argues that there are some of them left who would rise up against the Monoids and do better. The Doctor then strikes a bargain with the Refusians, whereby they will give the guardians one day to make their attempt before the Refusians employ defensive measures. The Doctor thanks him, and Dodo says it's now up to Steven and the others. The Doctor agrees.

In the kitchen of the Ark, Steven plots an escape plan that will involve Maharis helping them without him even knowing it. Just before Maharis comes to deliver their food, Steven and Venussa put some items under a blanket, and Dassuk hides. Steven distracts Maharis, while Dassuk slips out. And when Maharis asks where Dassuk is, Venussa points to the blanket and says he's sleeping. As soon as the coast is clear, Dassuk returns and frees all the prisoners.

Four says that as soon as they land, they will decide if One should stay in control and that if Refusis is dangerous, they need to return to the ship before it is destroyed.

As Steven and the prisoners are making their way to the control room, One decides that it is time to leave the ship for Refusis II after setting the bomb to go off in twelve hours. Steven and his friends arrive too late and set about scanning the ship in search of the bomb and finding a way to get to Refusis.

The launchers arrive on Refusis II, where One immediately claims the planet for his own. When they discover Two's destroyed launcher, One vows to find and destroy whoever did it. As the Doctor and Dodo listen in, Four says One made a mistake bringing them there and plots to challenge him and return to the Ark before the bomb goes off. As soon as the Monoids are out of sight, the Doctor, Dodo, and a Refusian enter the launcher and use it to contact Steven. They tell him they will send some launchers back whilst the Doctor tries to extract information from the Monoids regarding the location of the bomb.

The Refusians are tasked with piloting the launchers back to the Ark as the Doctor and Dodo leave, allowing themselves to be captured seconds later by Three, who watches in amazement as the launcher takes off with no-one in it.

Steven argues with Maharis, who is lamenting about how the Monoids left them behind, when they receive word that a launcher has returned from Refusis. The humans are surprised to see it appears to be unmanned, before a laugh rings out in the ship, alerting them to the presence of the invisible Refusian within.

When the Doctor is brought to One, he tells him, in all honesty, that he has never seen a Refusian, so he can't help him. One threatens the Doctor's life unless he starts being more helpful. This impasse is broken up by Four's challenge to One. Four says he wants to return to the ship but then points out the issue of the bomb. One laughs in his face and lets slip the location of the bomb, as well as the difficulty he'd have removing it, due to the weight of the statue. Four then says that he is returning to the Ark, and those who care for the future of the Monoids will join him. A number of Monoids leave with Four. As soon as he is gone, One states that he is going to follow them and spring an attack on them but also lets the Doctor and Dodo know he'll be dealing with them later.

Steven decides it would be best practice for the humans to split up. Half will go to Refusis II, while the other half will search for the bomb. Maharis openly disagrees with Steven and confronts him, saying they should all leave the micro-celled humans to perish. Venussa points out that Maharis has spent too long with the Monoids and no longer belongs to them. She suggests to Steven that Maharis be a part of the landing party, and Steven agrees. He tells Dassuk to take the launcher and to bring Maharis, as well as some of the other humans.

On Refusis II, One and his army confront Four and his army, and a full-scale civil war breaks out. During this madness, the launchers return. Ignoring advice to wait until things have calmed down, Maharis leaves the launcher and is immediately killed by One. The rest of the humans wait until there is a lull and form an escape. Dassuk finds the Doctor and Dodo, who escape through the undergrowth and return to the launcher, where they encounter Four, the last Monoid standing, who immediately tosses aside his gun. They board the launcher and as they take off, they contact Steven and inform him of the bomb's location.

Steven and Venussa are at a loss as to how to move the statue, due to its sheer size and weight. The Refusian says that he will be able to help, asking for the area around the statue to be cleared. The humans do as he asks and then, much to their surprise, the statue rises into the air, lifted by the super-strong Refusian. The statue is placed in the launching bay, and Venussa operates the controls — ejecting the statue into space, where it explodes harmlessly.

When the Doctor, Dodo, the humans and the surviving Monoids return, the Refusian says he will only accept them on his planet as long as they make peace with the Monoids. This is agreed to. The Doctor and his companions depart, leaving the humans to wonder if he will ever return to them again. Venussa and Dassuk watch as the TARDIS dematerialises.

Later, as the TARDIS arrives at a new destination, the Doctor sneezes and Dodo says she hopes he isn't catching a cold now. Suddenly, the Doctor simply fades and vanishes from the control room in front of Steven and Dodo, although they can still hear his voice. Dodo wonders if this has something to do with the Refusians, but the apparently invisible Doctor says it is some form of attack...


Uncredited cast[]


Uncredited crew[]


  • The statue is made of gregarian rock and was supposed to last forever.
  • The Commander says that the reign of Nero, the Trojan War and wars involving the Daleks all took place in the First Segment of Time.
  • Monitor lizards and locusts are among the creatures aboard the Ark.
  • There is an engraving of a zebra with two heads aboard the Ark.
  • A minifier is used to shrink most of the human population, in order to face the journey.

Story notes[]

  • This story had the possible working title of The Space Ark.
  • Although Lesley Scott, Paul Erickson's then wife, was credited as co-writer, she did no work on the scripts. Erickson later gave his reasons for sharing the on-screen writer's credit with her: "It was a personal arrangement I had with her, which was my own personal business at the time. The circumstances went into history. I need say no more than that." (REF: Doctor Who The Handbook: The First Doctor)
  • The Monoids were played by actors, each holding a ping-pong ball in his mouth to represent the alien's single eye. The upper portion of the actor's face was hidden by a "Beatle" wig. Their hair was Yak hair.
  • There are occasional lapses by Jackie Lane into the Lancashire accent in which she rehearsed the story before the production team were instructed by their superiors that it was unacceptable for a regular character in Doctor Who to speak in anything other than "BBC English". This proved challenging for Lane, as the script was written with her original speech pattern in mind. It would appear this rule was later relaxed, as companion Ben Jackson — introduced only four stories later in The War Machines — was allowed to keep his Cockney accent.
  • Peter Purves thought the Monoids looked ludicrous and couldn't take them seriously as a monster.
  • Michael Imison not only didn't think much of the story, but also was informed that his contract as a BBC director would not be renewed immediately before recording of the final episode, "The Bomb". Imison wasn't even told of this decision face-to-face, but was simply handed a note before entering the studio gallery at the start of recording.
  • This is the only story produced by John Wiles for which all episodes exist. It is also the earliest serial from the third season to exist in its entirety, and one of three alongside The Gunfighters and The War Machines.
  • It was John Wiles' idea to have a story set on a giant spaceship where cars and bicycles would be required to get around. Donald Tosh was sceptical that such a story could be done on the show's resources and linked the idea to the works of Arthur C. Clarke.
  • Donald Tosh knew Paul Erickson from working on Compact.
  • The script was originally devised with Katarina in mind before it was decided to kill her off. It was then re-written to feature Anne Chaplet.
  • This was the only contribution to the series of both writer Paul Erickson and director Michael Imison.
  • Michael Imison viewed directing the serial was punishment from the Head of Serials, Gerald Savory, as he and Savory's wife, actress Annette Carell, had come into conflict during the making of Buddenbrooks a year earlier.
  • It was reportedly Michael Imison who came up with the idea of creating the Monoids by having costumed actors use their tongues to manipulate a single “eye” set into their masks.
  • The Monoids replaced the original aliens which had featured in the original script.
  • Monica the elephant was forced to spend the night before filming in her van outside Michael Imison's home, after the van's driver was refused permission to park at Ealing.
  • During production, Innes Lloyd took Peter Purves aside and told him that his contract would not be renewed after his extension to twelve more episodes.
  • The first scene to be recorded was the miturisation effect for the male guardian played by extra David Greneau, who was not hired to appear in the next installment as another guardian.
  • During pre-production, incoming producer Innes Lloyd shadowed John Wiles in order to get a better understanding of the show.
  • A total of eight Monoid costumes were made by freelance artists John and Jack Lovell. To increase the number of Monoids aboard the Ark, the printed numbers on the voice collars would change between shots. Clever editing was also used so that the same Monoid could appear twice in the same scene, thus swelling their numbers.
  • To stimulate the effect of the invisible Refusians, wires and other techniques were used in various capacities. The footage of the Refusian Jungle was attached to wires, which were then moved when a Refusian walked through it, the objects inside the castle on Refusian II were moved with hidden wires, the controls inside Launcher 14 were operatd by stagehands hidden out of shot and wires were placed underneath the seats, which were then pulled down when a Refusian sat on them.
  • To save money on sets and set dressings, many of the computer banks were taken from stock and Barry Newbery used angled mirrors to increase the number of storage cabinets.
  • Freelance designer Peter Pegrum provided cut-out models of miniaturised humans, which would ultimately go unused.
  • The gates which made up a part of the castle of Refusian II had previously been designed by Barry Newbery for The Crusade.
  • Just before recording commenced on "The Bomb", Michael Imison found out that his contract with the drama series and serial department had not been renewed. He believed that it was due to the serial overrunning.
  • This is one of only five stories to be the sole credit for both the writer and director - The next wouldn't occur until The Horns of Nimon (although writer Anthony Read had previously gone uncredited for The Invasion of Time). The other three are Meglos, The Awakening and the 1996 TV Movie, as well as the Torchwood episode Random Shoes.
  • For "The Bomb", Michael Imison broke with the typical recording pattern, in which each scene was taped in story order. Instead, the schedule was partly organised to keep scenes on certain sets grouped together, and also to avoid having to move the bulky Launcher prop any more than was necessary. This was the first time out-of-order recording had been employed to such a large extent; it would be a sign of coming changes to the way the programme was made.


  • "The Steel Sky" - 5.5 million viewers
  • "The Plague" - 6.9 million viewers
  • "The Return" - 6.2 million viewers
  • "The Bomb" - 7.3 million viewers

Filming locations[]

Production errors[]

If you'd like to talk about narrative problems with this story — like plot holes and things that seem to contradict other stories — please go to this episode's discontinuity discussion.
  • Towards the end of "The Steel Sky", the shadow of a boom mic can be seen on a wall when a Monoid uses a vehicle to take a fever-struck Monoid into the main control room.
  • At the start of "The Plague", a cue can be heard off-screen.
  • When Two kills a Guardian early in "The Return", he is clearly still breathing.
  • When the Doctor, Dodo, Yendom and Two leave the craft onto Refusis II, the papers which come together to form the mountain behind them are visible.
  • When the landing party enter the castle on Refusis II, Two trips up on the step leading down from the door.
  • When the statue explodes after being ejected into space in "The Bomb", it simply disappears from against the space backdrop and then the explosion occurs; the effect appears to have been mistimed. (The model statue was not actually blown up, as Michael Imison kept it as a souvenir afterwards.)
  • During the final confrontation between One and Four on Refusis II in "The Bomb", Edmund Coulter (Monoid One) fails to switch on One's communicator collar before Roy Skelton (Monoid Voice) delivers One's lines.
  • When the first group of Monoid launchers depart the Ark toward Refusis II in "The Bomb", the wires above the launchers are visible.


  • In TV: The Ark in Space, the Earth was also evacuated because of solar flare activity that rendered the biosphere uninhabitable for five thousand years. There, however, the survivors of mankind slept in suspended animation and returned to repopulate the planet after that period had passed.
  • When questioned by the humans as to things he has seen on his travels, the Doctor seemingly mentions events from TV: The Romans and The Myth Makers and mentions the Daleks. All of this took place in what the humans called the First Segment of Time.
  • The Earth is seen trailing smoke as it heads towards the Sun at the close of "The Plague". However, the National Trust, over the billions of years that followed, preserved it and restored it into a "classic Earth" before it was finally destroyed by the expanding sun. (TV: The End of the World)
  • The Monoids also feature in the AUDIO: The Kingdom of the Blind.
  • The Silurians built an ark of their own when they believed that the Earth was about to be destroyed millions of years earlier. (TV: Dinosaurs on a Spaceship)
  • After being conditioned by the artificial intelligence WOTAN on 20 July 1966, Dodo suffered a nervous breakdown. She left the TARDIS soon after. Her claims to have met one-eyed reptile men and other similarly outlandish stories resulted in her being sent to a psychiatric institution. (PROSE: Who Killed Kennedy)

Home video and audio releases[]

DVD releases[]

A commentary for this story was recorded in October 2009, and it was released on DVD on the following dates:

Region 2 - 14 February 2011
Region 1 - 8 March 2011
Region 4 - 3 March 2011

Special Features[]

Digital releases[]

This story is available:

  • for streaming through BritBox (US) as part of Season 3 of Classic Doctor Who.

Video releases[]

Audio releases[]

The Arkcd

The 2006 audio soundtrack.

  • BBC Audio released an audio CD edition containing the audio tracks from the original episodes, along with linking narration by Peter Purves, in 2006.


External links[]