A newly regenerated Doctor joins UNIT in an investigation into the theft of top secret plans and equipment from supposedly secure premises. Sarah discovers that the raids have been carried out by a robot invented by scientist Professor Kettlewell while he was working for Think Tank, a body involved in developing emerging technologies.
The robot has been reprogrammed on the orders of Miss Winters, the director of Think Tank, and used to obtain the means for constructing a disintegrator gun with which the Scientific Reform Society - of which she is a leading member - can steal the computer codes controlling the nuclear weapons of the world's leading powers. In this way, the SRS hopes to hold the world to ransom unless its demands for a purer way of life are met.
Kettlewell is killed by the robot after he balks at Miss Winters' ruthlessness. The robot then suffers an electronic mental breakdown and tries to activate the nuclear weapons.
The Brigadier attempts to destroy it with the disintegrator gun, but this merely causes it to grow to gigantic proportions, following which it goes on the rampage.
The Doctor, assisted by UNIT medical officer Harry Sullivan, destroys it with a metal virus described in Kettlewell's notes.
Tom Baker | Doctor Who | |
William Hartnell | Dr. Who | |
Jon Pertwee | Doctor Who | |
Patrick Troughton | Dr. Who | |
Frazer Hines | Jamie | |
Nicholas Courtney | Brigadier Lethbridge Stewart | |
Pat Gorman | Guard | |
Elisabeth Sladen | Sarah Jane Smith | |
Jacqueline Hill | Barbara Wright | |
William Russell | Ian Chesterton | |
Katy Manning | Jo Grant | |
John Scott Martin | Dalek | |
John Levene | Sergeant Benton | |
Peter Davison | The Doctor | |
Janet Fielding | Tegan | |
John Leeson | K9 | |
Terry Walsh | Primitive | |
Gerald Taylor | Dalek | |
Robert Jewell | Dalek | |
Carole Ann Ford | Susan Foreman | |
Peter Hawkins | Dalek Voices | |
Cy Town | Dalek Operator | |
Roy Skelton | Daleks | |
Wendy Padbury | Zoe | |
Sarah Sutton | Nyssa |
England, the near future. Something inhumanly strong and resilient is raiding scientific establishments across the country. Can the new Doctor help UNIT? And what are the staff of the secret government think tank working on in their spare time?
England, the near future. Sarah Jane Smith meets a gigantic robot, and the Doctor finds himself struggling for his life.
England, the near future. The Doctor attempts to thwart the plans of a group of unscrupulous scientists who threaten the Earth's destruction, and plan to use their giant robot to obtain the power they need to blackmail the world into obeying them.
England, the near future. The Robot grows to gigantic proportions and goes on a rampage. The Doctor finds the solution in a test tube.