Under the Lake (TV story)

 was the third episode of the ninth series of Doctor Who produced by BBC Wales. It saw the series return to the idea of giving a hauntings an in-universe explanation, in this case due to alien interference.

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
 * Tim Lunn - Zaqi Ismail
 * Alice O'Donnell - Morven Christie
 * Bennett - Arsher Ali
 * Pritchard - Steven Robertson
 * Prentis - Paul Kaye

Individuals

 * The Doctor claims to have once had Peter Andre's song Mysterious Girl stuck in his head for two weeks, and states that it drove him mad.
 * The Doctor claims to have once met Shirley Bassey.
 * The Doctor claims that Clara once had an argument with Gandhi.

Languages

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

Story notes

 * The sonic sunglasses can connect to Wi-Fi.
 * The Doctor uses cue cards to give apologies.

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)

DVD releases
to be added

Blu-ray releases
to be added