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Part one
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Part two
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Part three
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Part four
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Continuity

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Part one
In 1908 Adela Forster attempts to escape from some unseen threat with her son Jonathan Forster, however he is taken by the unseen threat and she barely manages to escape.

The TARDIS materialises in 1926 on a train platform and has brought the Doctor, Tegan, Turlough and Nyssa to Calcutta, India, on the Doctor's insistence they watch the famous cricket match between All India and Marylebone Cricket Club. Before they can go to the match, however, Nyssa is attacked and bitten by Kimball, a chauffeur and friend of Professor Narayan, after she tries to calm him down while he makes a commotion on the platform and in the meantime the Doctor sends Tegan to gets medical supplies from the TARDIS so they can help him as he realises the man has been infected with what appears to be rabies. It is too late though when he is shot and killed by Major Cyril Haggard arrogantly claiming to an appalled Doctor that he was taking care of the situation and saving their lives before he boards the train. The Doctor believes Nyssa has been infected with rabies but if he can treat it quick enough she should be fine while he tries to bring Nyssa back to consciousness. Professor Narayan explains the situation while a delirious Nyssa slowly comes to and Tegan bumps into a mysterious man and later finds the TARDIS gone from where they had left it, and returns to inform the Doctor. They spot it on the train which is leaving the station, so the Doctor instructs Tegan and Turlough to get aboard and remove it or at least get the medical supplies at the next station and that he and Nyssa will follow them on the next train.

Aboard the train, Major Haggard finds and confronts Adela Forster, claiming he is taking over the train despite her attempts to throw him off, claiming she rented out the entire train. Tegan and Turlough, meanwhile, find themselves locked in a cage with a dangerous tiger. The Doctor, Nyssa and Professor Narayan drive Professor Narayan's Rolls-Royce Silver Ghost after the train when suddenly Nyssa tells the Doctor she's seeing double, except that she can both see them chasing the train but she can also see Tegan and Turlough in front of her, screams that the tiger with the emerald eyes is going to kill them, grabs control of the wheel in an attempt to catch up with the train and save them but the car ends up careering out of control...

Part two
The Doctor is awakened by Professor Narayan and they find that Nyssa has slipped into a coma. He comments that it is unusual because when Kimball was bitten, he didn't have the same reaction. The Doctor reckons it is due to Nyssa's different metabolism, while the Professor explains the circumstances behind how Kimball was bitten, because he was investigating the Karabar Caves, since his field of expertise is mythology and folklore and the caves are his favourite place to do research. Despite the car being broken, they find an air balloon owned by Colonel Burroughs and "borrow" it, deciding to go to the Karabar caves the source of the bites. Tegan manages to slip out of the car to find the owner of the tiger so that they might muzzle it so Turlough can get out in one piece. She finds Major Haggard and Adela Foster, and explains what happened. Turlough, meanwhile discovers the tiger is named Dawon and can talk as it shares a mind with Nyssa and it recognises him as a friend and explains the situation. Tegan, the Major and Adela arrive and the tiger tells Turlough not to reveal it can communicate with them. Adela explains to Tegan that there are no other stops on their route and she goes to check on the TARDIS, while Adela explains to Turlough that they are headed to the Karabar caves.

Professor Narayan explains the mysteries of the caves to the Doctor as Adela explains to Tegan how her husband Edgar Forster, a naturalist, went exploring to try and find the fabled city where creatures were made of crystals and he brought her and their son Jonathan with them, wanting to find it and make a name for himself as a great scientific discovery. However, she ended up losing both of them but in a last-ditch effort managed to seal the cave's entrance, saying that something evil was located at its center in order to stop it escaping. Years later, when word reached her about a tiger with "crystal claws", she realised that the creature in the cave had found a way out and has now returned, with a train full of dynamite, to properly finish the job. In the meantime, Major Haggard lets himself out and locks the compartment from the outside, claiming that since Adela has seen his briefcase full of money and they know of his presence, they know too much as he is a thief and does not want to be caught. He then kills the driver and sets the train to crash through the station and go off the mountain, killing all witnesses and allowing his getaway. He is thrown out by Tegan, however, she cannot stop the train. Nyssa awakens and instructs the Doctor on how to find them, which they manage to by turning the balloon into a high-powered ship. Tegan spots the Doctor and guessing the situation, he uncouples the cables holding the cars together in an attempt to stop the whole train from going through the station and over the cliff but it seems too late...

Part three
The Doctor manages to uncouple the car and save Turlough and Lady Adela but the front of the train ends up going through the cliff and Tegan is presumed dead. Meanwhile the hot air ballon, containing a grieving Nyssa over Tegan's apparent demise and a consoling Professor Narayan over-shoots the station and ends up descending down into the depths over the cliff, with the Doctor promising Nyssa he will come rescue her. In her last words, she tells the Doctor to talk to the tiger. Turlough finds the Doctor and explains everything while Major Haggard, having been jettisoned, comes to, fixes his shoulder and prepares to go to the caves on foot. The Doctor talks to Dawon and he, the tiger, Turlough and Lady Adela set out to find Nyssa and Professor Narayan. Meanwhile, suspended in the hot air balloon as it has crashed in the trees, Professor Narayan realises he is back where he came from and explains to Nyssa his back-story, as he is Ayyappan the destroyer, the sister of Dawon and brother of Shardul Khan. Meanwhile Dawon finds and attacks Haggard but he shoots her and escapes, while the three find her and the Doctor attempts to help her recover. Haggard is found by the Doctor and escapes but supposedly finds his demise at the beetle's, whose bite can kill. Adela lights a fuse on a stick of dynamite she brought to try and stop the beetles escaping the cavern in fear. A snake attacks Nyssa in the balloon and Professor Narayan saves her at the cost of being transformed and he warns her to run away as he will soon lose control of himself and begin chasing her.

The four discover that the water they saw earlier is actually because of a lake nearby and the dynamite set off by Adela 10 years ago and just now have caused the fissures to tear and Dawon is swept away by the incoming current while Adela goes after her, followed by the Doctor and a reluctant Turlough in the stream. They manage to save Dawon who tries to find Nyssa using their connection. Meanwhile Nyssa is found by the other wolves in the cavern and begins to change due to the curse of the 'Emerald Tiger'. However, she is found in time and at first is saved by the Doctor, Turlough, Adela and Dawon. However, they begin losing to wolves until they are chased away by an elephant one of whose rider is revealed to be Tegan...

Part four
Tegan explains how she survived, first taking shelter inside the TARDIS as the Doctor he given her the key earlier to survive the train crash, after which she was found by Djahn. He helps her to find the others and is reunited with his mother Adela, as they realise thanks to the book with Djahn (which happens to be "The Jungle Book") that he is Jonathan. Nyssa surmises that Dawon raised Jonathan due to her motherly instinct while her brothers merely sought death and destruction. In the meantime they try to find Dawon and the Professor, who it transpires are being held captive by Shardul Khan who has swallowed them as he has, after years of separation from his brother and sister, absorbed the emerald tiger and plans to take control of the entire kingdom. While discussing what happened, the Doctor realises that the jungle's perimeter is similar to an impact crater and realises that the resulting life forms, a fusion of flesh and mineral materials, is likely the result of the emerald tiger which he then realises must not be from Earth. Nyssa begins to suffer headaches as her mental connection is strained while Dawon and Ayyappan battle Shardul for control of the emerald tiger. They find a temple and make their way inside while Shardul kills Dawon and Ayyapan. The Doctor explains that the emerald tiger may be the exceedingly rare and fragile mineral homogenite and hence responsible for the strange fusion of beast and mineral in this jungle. They are cornered by Shardul Khan but the Doctor tries to taunt him, however, Adela lights dynamite and places it next to the crystal, and threatens Khan (who was distracted by the Doctor) with its destruction (which will destroy him). The Doctor instructs Turlough and Tegan to take Adela and an injured Jonathan (who attacked Khan after discovering that Khan had killed his foster mother Dawon) out of the cave and get to safety in the TARDIS. Nyssa holds off Khan and instructs the Doctor to leave despite his protests as she begins transforming again against her will, hoping to use the last of her mental connection to the absorbed Dawon to hold off Khan until the dynamite goes off and destroys the crystal, finishing him off for good. The dynamite goes off and the crystal is destroyed, taking Khan with it.

They manage to find Nyssa buried in the rubble after the destruction of the temple and find that the detrimental effects the crystal had been inflicting on her have been halted and have disappeared, although she seems to have become rejuvenated and looks as she did when she stopped traveling with the group before to stay on Terminus. Adela decides to stay with her son Jonathan and live with him in the jungle and the four head back to the TARDIS.

Continuity

 * When Professor Narayan explains that the Karabar caves and their mysterious activity are inexplicable, the Doctor corrects him by saying "not inexplicable, only unexplained". The fourth Doctor said the same thing to Leela who thought a yo-yo was magic until the Doctor corrected her. (TV: The Robots of Death)
 * The Doctor quotes Isaac Newton's First Law of Motion and after claims "You've never let me down Isaac". The Doctor has met Issac Newton on a few occasions, and even once tried to explain the concept of gravity to him. (TV: The Pirate Planet et al, AUDIO: Summer et al.)
 * The Doctor tells Lady Adela "brave heart", something he often told Tegan. (TV: Earthshock et al.)

Part one
The Doctor, Tegan, Turlough and Nyssa land on a colony in the year 3556 due to the TARDIS being brought there by a signal. They meet Sibor who explains to them about the chronoscope and that their planet Valderon is governed by the predictions of the chronoscope and that people are arrested before they commit the crime. She also explains that the planet is in quarantine as it is a place for researching a treatment for Richter's syndrome, and the prisoners on the planet are used as scapegoats for testing cures. They are greeted by Galen (really Adric Traken, who uses the pseudonym as he saw his mother earlier and mistakenly thinks that he is meeting her at an earlier point in her life before she stayed on Terminus and uses the name to avoid a paradox that his mother would often warn him about), who is a researcher and asks to speak to Tegan privately since she is carrying biomes and microorganisms not seen for thousands of years. Once alone, Adric reveals the truth to Tegan. Tegan, immediately realising the consequences that Adric thinks it's an earlier point in time and asking for them to save his mother, creating a paradox as she will have never left Terminus in the first place. She informs the Doctor of the situation who realises the severity and proceeds to get everyone back to the TARDIS and get away as soon as possible, despite earlier being intrigued by the chronoscope and being reminded by Turlough that they'd come to investigate the strange signal picked up by the TARDIS. Angered at never being trusted, Turlough storms off to go talk to Adric. Turlough tells him the truth not knowing the severity and Adric becomes angry at his mother seemingly having left them to travel.

The Doctor tries to get Tegan and Nyssa to the TARDIS but Tegan tells Nyssa and they are then found by Sibor, who brings them back to see Adric, and leaves them alone. Adric asks to speak with Nyssa privately and reveals to her he knows and tells her about her own future, in doing so sealing Nyssa's fate and never allowing her to return to the time just after she disappeared, ensuring that the cure for Richter's syndrome she discovered is not found earlier, Lasarti, her husband, dies ten years before, alone, and Neeka becomes infected. The Doctor suspects he has told her everything behind closed doors but just then Sibor arrives with armed guards to arrest Tegan and Turlough as the chronoscope has just predicted they will commit murder by killing a watchman to make their escape and the Doctor realises the problem...

Part two
Nyssa and Adric talk about what happened over the past 25 years since she was declared dead after going missing (really ending up joining the Doctor again) and realise that they both have the other part needed to create the cure for Richter's syndrome. They prepare to create the cure but are interrupted by Mahandra who informs them that Sibor has arrested Tegan and Turlough. The Doctor, meanwhile, tries to defend them at their trial but loses and the two are locked up. Nyssa angrily confronts the Doctor and berates him for the choices he made and keeping information from her. Tegan and Turlough start to hear voices in the prison, while Nyssa, in the process of preparing a vaccine for Richter's syndrome, also hears the voices which takes the Doctor's attention away from finding a way to get Tegan and Turlough out. The cure is successful but Sibor arrives and arrests Adric, saying that she plans to use the cure they have just developed as a leverage against the Earth Empire in order to become prime designate.

The mysterious voice draws Turlough out of the prison and Tegan and Kartis (a wrongly accused convict from earlier) follow him until he finds a mysterious white cabinet in the center of the prison. Meanwhile the voice reaches out to Nyssa while she, the Doctor and Mahandra attempt to get into the prison to save Tegan and Turlough and in the meantime Adric escapes the alcazar and attempts to make contact with the Earth Empire to let them know they have found a cure. However his message gets completely scrambled into incomprehensible languages while Mahandra explains "Miracle Day" to the Doctor as they search the prison, how one day everyone on the planet suddenly woke up and were able to understand every possible language. They eventually find Tegan who has been knocked out by Turlough as he attempts to wire up the "cabinet" to give it power. Just then it sends out a telepathic field that knocks almost everyone except the Doctor unconscious and to his horror, it takes control of Tegan and Turlough and reveals itself to be the source of the chronoscope as Adric is captured by Sibor, and it reveals itself to be the Doctor's first TARDIS, his type 50 TARDIS...

Part three
The Doctor's type 50 reveals how it barely managed to escape Gallifrey and crash-landed on Valderon, where Sibor found it and realising its potential kept it trapped and used it as the chronoscope. However, it reveals that it was actually part of its plan and explains how it managed to lure the Doctor here and expresses its desire to have the Doctor return it home. The Doctor agrees but only if it releases Turlough and Tegan from its mind control which it does. He then shuts off its power and assures Turlough he'll keep the promise but would prefer to have it relieved of power.

Sibor, who has found out about what's going on, takes Nyssa and Adric hostage and finds the type 50 TARDIS, and hooks it back up to its power source from the planet's power supply but ends up getting electrocuted in the process. It then seemingly dematerialises. Nyssa finds the Doctor and explains everything and they are soon joined by Tegan and they return to the TARDIS to try track the type 50. However, it is revealed that the Tegan with them was merely the type 50 TARDIS using its still-functioning chameleon circuit to disguise itself. It then puts the TARDIS in a temporal state of grace and captures Nyssa and the Doctor. It brings Nyssa back to 3531 in an attempt to change the timeline and offers Nyssa a chance to watch her children grow up as she had missed when she began travelling with the Doctor again and was presumed dead. The Doctor tries to stop her, citing the irreparable damage she will cause to the timeline but she cannot restrain herself and departs. The Type 50 then "eats" the Doctor's TARDIS's dematerialisation circuit and leaves, stranding the Doctor. Meanwhile, the real Tegan finds Turlough and Adric and they go to find the Doctor, who explains the events that had just transpired. He explains that they have to stop the type 50 as it has now created two timelines and the results will be an explosion that could wipe out half the galaxy....

Part four
The type 50 materialises in front of Katris and Mahandra and takes on the form of the deceased Sibor and takes over their minds. Inside the TARDIS, the Doctor has Adric reach out to his mother in the past which is now altering the future using the TARDIS telepathic circuits to convince her not to go inside, and after finally getting through to her, manages to convince her to fly off-world to somewhere far-away and distant and have no contact with any of them for the next 25 years. The Doctor explains that this will stop the new timeline being created and stop the blinovitch limitation effect which the type 50 is using as an energy source to rebuild itself. The timeline stabilizes and they are able to finally exit the TARDIS without being destroyed by the effects which had hindered their earlier attempts to escape, and find Nyssa arriving on a shuttle, having had to wait out the 25 years alone and due to this has become bitter and resentful, especially of the Doctor.

They then confront the type 50 but discover that there is a paradox still keeping it alive: moments earlier, Nyssa had revealed to the Doctor that Galen is really Adric, her son and that she was contacted by the Doctor before he regenerated, and when she told him then she was a mother, he was extremely surprised, seemingly unaware, something from his future he should not have known about. The Doctor, however, realises a loophole: since Nyssa wasn't aware whether he actually really knew and was acting surprised, or really wasn't aware, he can do his best to feign surprise and still keep the timeline intact. The paradox resolved, the type 50 collapses, out of power and seeing nothing but its own demise. After talking with the Doctor, it has a change of heart and using its final power it helps the Doctor erase the 25 years Nyssa had to wait, partially re-setting the timeline, and the type 50 destroys itself, taking the paradox with it while a saddened Doctor and Nyssa watch on. Those possessed by the type 50 who were knocked unconscious slowly come to as well.

They regroup with Tegan, Turlough and Adric and explain what happened. They prepare to leave and Nyssa promises Adric that she'll return to see him soon after he offers to take her to see Neeka, who he is on his way to cure with their newly developed cure to Richter's syndrome. Nyssa declines but makes him a promise to come see him again, and they agree to meet on Valderon in one month's time. She then enters the TARDIS, and asks the Doctor to take her to Valderon, one month in the future and they set off.

Adric reveals that despite the promise, it was the last time he ever saw his mother.

Continuity

 * The Doctor jokes about not being able to get the dematerialisation circuit to work for years. (TV: An Unearthly Child et al.)
 * When Turlough mentions the blinovitch limitation effect, Tegan asks like having the two different Brigadiers. This happened during the events of TV: Mawdryn Undead. The Doctor also met an alternate timeline version of the Brigadier during his third incarnation. (TV: Inferno)
 * The Doctor has Adric use the TARDIS's telepathic circuit s to reach and communicate with his mother in 3531 to stop her from changing history. He had Clara use them to help them find Danny Pink after he died. (TV: Dark Water) They also interfered with the Uknown Warrior's funeral and Frances in the 20th century. (TV: The Mouthless Dead)
 * When Turlough offers the Doctor his gun, the Doctor refuses, citing "he never carries guns". The Fifth Doctor earlier tricked a guard by putting a pipe on his back into thinking he had a gun when he didn't. However, the Fifth Doctor has been known to use weapons on some occasions. (TV: Earthshock et al. )