Under the Lake (TV story)

 was the third episode of the ninth series of Doctor Who produced by BBC Wales.

It saw the show reprise the concept of hauntings, which was last explored in Hide. The episode gives this idea a much more thorough explanation than previous stories.

It also continued the previous story's concept of the Doctor apparently facing death, as the ghostly transmitter-version of him is shown at the end of the episode.

Synopsis
Arriving on an underwater base under attack, it's up to the Doctor and Clara to save the frightened crew. But also onboard is an alien spaceship, and the base is being haunted by the most impossible of things.

The Doctor's deepest beliefs are challenged when he encounters something he cannot explain. Can it really be possible? Can ghosts be real?

Plot
to be added

Cast

 * The Doctor - Peter Capaldi
 * Clara - Jenna Coleman
 * Moran - Colin McFarlane
 * Cass - Sophie Stone
 * Lunn - Zaqi Ismail
 * O'Donnell - Morven Christie
 * Bennett - Arsher Ali
 * Pritchard - Steven Robertson
 * Prentis - Paul Kaye

Individuals

 * The Doctor claims to have once met Shirley Bassey.
 * The Doctor claims that Clara once had an argument with Gandhi.

Food and beverages

 * A cup of coffee is standing on a table.
 * Clara says the Doctor raved about ghosts like a kid who have had to much sherbet.

Languages

 * The Doctor can no longer understand British Sign Language. He believes he deleted it from his memories, and replaced it with semaphore.

Popular culture

 * The Doctor once had Peter Andre's song "Mysterious Girl" stuck in his head for two weeks, and said that it drove him mad.
 * Cass refers to the Doctor doing "the Cabin in the Woods" things.

Story notes

 * The sonic sunglasses can connect to Wi-Fi.
 * The Doctor uses cue cards to give apologies.
 * Vector Petroleum is the upper-most in charge of the Drum. The the Drum intercom voice gave messages to when certain areas of the base was under attack.
 * Some long-necked people were mentioned by Clara, to have been celebrating New Year for two centuries.
 * The Doctor can calculate how long a place has been abandoned only by putting his finger in a cup of coffee.
 * Clara tries to get the Doctor to high five her, unsuccessfully.
 * The base has a Faraday cage which the ghosts can't enter, or if inside, get out from.
 * The Doctor mention holograms.
 * Drum Control is where the rest of the base is controlled.
 * Topside is the commander of Vector Petroleum.
 * The Doctor mentions that his UNIT security visa is 7-1-0-Apple-0-0.
 * The base have a submarine that can be controlled with submarine manipulator rings.
 * A suspended animation chamber is found under the water.
 * Magnetic coordinates were used by the ghosts.
 * The Doctor took his radio apart to make a clockwork squirrell.

Ratings

 * BBC One: 3.74 million
 * BBC America: to be added

Continuity

 * The Doctor uses his sonic sunglasses. (TV: The Witch's Familiar)
 * One of the ghosts was previously a Tivolian. (TV: The God Complex)
 * The Doctor has previously landed in an underwater base, in which he met with a crew that were tackling a threat that would re-animate the dead crew. (GAME: Shadows of the Vashta Nerada)
 * The Doctor uses his psychic paper as proof of ID. (TV: The End of the World et al)
 * The psychic paper tells them that he works for UNIT. (TV: Spearhead from Space et al)
 * One of the Doctor's apology cue cards says: "It was my fault, I should have known you didn't live in Aberdeen". The Fourth Doctor made an identical mistake, dropping Sarah Jane Smith off there rather than South Croydon. (TV: The Hand of Fear, School Reunion)
 * Another of the cue cards says: "No one is going to be eaten / vapourised / exterminated / upgraded / possessed / mortally wounded / turned to jelly. We'll all get out of this unharmed." "Exterminated" is a reference to the Daleks, (TV: The Daleks et.al.) "upgraded" is a reference to the Cybermen, (TV: Rise of the Cybermen et.al.) and "possessed" is a reference to various races and beings. (TV: The Impossible Planet/The Satan Pit et al)
 * When the Doctor goes back on his insistence that the phantoms of the dead aren't ghosts, he notes that they aren't flesh avatars, (TV: The Rebel Flesh/The Almost People) Autons, (TV: Spearhead from Space et.al.) or "digital copies bouncing around the Nethersphere". (TV: Dark Water/Death in Heaven)
 * The Cloister Bell alerts the Doctor to a threat to the TARDIS. (TV: Logopolis, Resurrection of the Daleks et al)
 * The Doctor indirectly refers to Danny Pink (TV: Into the Dalek-Death in Heaven) when suggesting a new relationship for Clara.
 * The Doctor mention Death when telling about a song that drove him insane.

DVD releases
to be added

Blu-ray releases
to be added