Doctor Who

The Stolen Earth (1) - S4-E12

Trivia: When Harriet Jones is explaining the sub-wave network to the Doctor's companions she says "It was created by the Mr. Copper Foundation." This is a reference to Mr. Copper from "Voyage of the Damned", who stayed to live on Earth and who probably would have had the advanced technology from the planet Stow where he came from.

Professor Lazarus

The Poison Sky (2) - S4-E5

Trivia: When the Doctor puts on the gas mask and looks at the soldier who already has his mask on, he asks, "Are you my mummy?" This was a reference to the episode "The Empty Child", where infected people wearing gas masks constantly say "Are you my mummy?"

Maria Santos

Planet of the Dead - S4-E15

Trivia: Lady Christina de Souza, one-shot companion for this episode, was based on ideas for the companion that would have succeeded Ace if the classic series had lasted to a season 27.

Silence in the Library (1) - S4-E8

Trivia: When this episode and "Forest of the Dead" were made, only Steven Moffat and Alex Kingston knew who River Song really was. As a result, not only is the Doctor's confusion genuine, David Tennant famously admitted that he chose to act as if the Doctor thought that she was a future incarnation of his, even though he knew that, even with what little information was given on River in the story, that theory made no sense.

The Waters of Mars - S4-E16

Trivia: The lines about the bio-dome having birds, when the Doctor and Adelaide are looking for Andy, were inserted after the lights of filming woke the birds up at the botanical garden where the bio-dome scenes were shot.

Turn Left - S4-E11

Trivia: Early drafts of this episode had the Carrionite invasion in 1599 (from "The Shakespeare Code") and the Dalek invasion in 1930 (from "Daleks in Manhattan"/"Evolution of the Daleks") stopped by UNIT time-travelling commandos, but this was cut for time and being unnecessary to the main plot.

Midnight - S4-E10

Trivia: David Troughton, who plays Professor Hobbes, is the son of Second Doctor Patrick Troughton. He previously appeared in the classic series twice: alongside his father in "The War Games" as minor character Private Moor, and in the Third Doctor story "The Curse of Peladon" as King Peladon.

Turn Left - S4-E11

Trivia: The UNIT soldier who is seen reporting that the Doctor is dead when Donna arrives at the scene the night of the Christmas Star incident is Private Harris, one of the soldiers who was mind-controlled by the Sontarans in the normal universe in "The Sontaran Stratagem"/"The Poison Sky."

Planet of the Ood - S4-E3

Trivia: The Oodsphere is in the same solar system as Sensesphere, homeworld of the Sensorites from the First Doctor story of the same name. There's a reason the Doctor says that he's been to this system before.

The Stolen Earth (1) - S4-E12

Trivia: The Doctor mentioning that someone tried to move the Earth once before, a long time ago, is a reference to the First Doctor serial "The Dalek Invasion of Earth", in which the Daleks intended to replace the planet's core with an engine in order to do the moving. And, of course, the Daleks are responsible for this episode's titular planet theft as well.

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New Earth - S2-E4

Continuity mistake: As the camera zooms out when Rose is captured and Cassandra is about to "go" into Rose, the psychograft disappears, but in the next shot of Rose it appears again. (00:11:45)

LizzieWD

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Midnight - S4-E10

Question: Is there any information on the entity shown in "Midnight?" It seems interesting enough to have some depth to it. It seemed to be bad in nature. It also seems to have been exactly what the woman that was possessed was afraid of.

Knever

Chosen answer: No, no information is avalible for the identity of the entity.

Repo_Man

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