Doctor Who Season 12
| No | Code | Title | Air Date | Eps | Exists |
| 75 | 4A | Robot | 28 Dec 1974 | 4 | All |
| 76 | 4B | The Ark in Space | 25 Jan 1975 | 4 | All |
| 77 | 4C | The Sontaran Experiment | 22 Feb 1975 | 2 | All |
| 78 | 4D | Genesis of the Daleks | 08 Mar 1975 | 6 | All |
| 79 | 4E | Revenge of the Cybermen | 19 Apr 1975 | 4 | All |
Notes:
The Doctor regenerates into his fourth persona, played by Tom Baker. Harry Sullivan joins when Sarah-Jane tricks him into going into the TARDIS in Robot.
Episode Details
Robot
Still unstable from his regeneration,
the Doctor is spending much of his time in the UNIT sick bay. Sarah-Jane decides to use
the opportunity to investigate a top secret government Think-Tank. She becomes suspicious
that all is not as it should be and that a large Robot under the control of the Think-Tank
is responsible for a number of break-ins at top secret military bases.
NTSC Video release by CBS/FOX (8103)
The Ark in Space
The Doctor, Sarah and Harry arrive on a
deserted space station in the distant future. They discover that it contains the entire
population of Earth in hibernation who have not reawakened when they should have done
because of a fault in the computer. In the meantime, the station has been invaded by the
Wirrn, a large insect like animal who have other plans for the sleeping humans...
NTSC Video release by CBS/FOX (5420)
The Sontaran Experiment
Transported back to Earth of the
distant future from the Ark, the Doctor Harry, and Sarah discover that they have unwelcome
company - a Sontaran warrior. The warrior is involved in deadly experiments to assess the
human race as an adversary prior to a full scale invasion of Earth.
NTSC Video release by CBS/FOX (5946)
Genesis of the Daleks
The Doctor and his companions are
transported back in time by the Time Lords who have decided that the Daleks need to be
destroyed. The Doctor's mission is to change history so that they have never existed. Soon
they are separated and The Doctor and Harry are captured by the evil Elite of the mad
scientist Davros, who is working to perfect his Mark 3 travel machine; the Dalek.
NTSC Video release by CBS/FOX (5946)
Revenge of the Cybermen
Returned to the Space Station by the
Time Ring, the Doctor and his companions discover that it is in the grip of a fatal
disease which has killed most of the crew. What is the secret of the asteroid it is being
used to mark? Which of the crew is the traitor who is in league with the dreaded Cybermen?
NTSC Video release by CBS/FOX (3714)
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