Story Code '4A'
by Terrance Dicks
The Doctor recovers from his recent regeneration, and joins the Brigadier and UNIT in an investigation into the theft of top-secret plans for a disintegrator gun from a government establishment. The Doctor and Sarah discover that these raids have been performed by a robot invented by Professor Kettlewell, who is working for Think Tank, a scientific body involved in developing new technologies. Behind Think Tank is the Scientific Reform Society, which, led by its director, Miss Winters, plans to use the robot and the disintegrator gun to steal a set of destructor codes. These codes will enable the SRS to hold the world to ransom - they will activate a nuclear arsenal unless the nations of the world meet their demands for a purer way of life. Kettlewell refuses to accept Miss Winters' ruthlessness, but is killed by the robot. The robot suffers a mental breakdown from killing its creator, and attempts to activate the nuclear weapons. When the Brigadier tries to destroy it using the disintegrator gun, the robot absorbs the blast and grows to gigantic proportions, captures Sarah and goes on a rampage. The Doctor and Harry Sullivan, UNIT's Medical Officer, use Kettlewell's notes to create a metal virus, which destroys the robot, ending its rampage. Harry joins the Doctor and Sarah in their travels in the TARDIS.
Tom Baker (Doctor Who), Elisabeth Sladen (Sarah Jane Smith), Ian Marter (Harry Sullivan), Nicholas Courtney (Brigadier Lethbridge-Stewart), John Levene (Sergeant Benton), Patricia Maynard (Miss Winters), Michael Kilgarriff (Robot), Edward Burnham (Professor Kettlewell), Alec Linstead (Jellicoe), Timothy Craven (Short)
Produced by Barry Letts
Directed by Christopher Barry
Part 1 - 28th December, 1974 @ 5.35pm - 6.00pm
Part 2 - 4th January, 1975 @ 5.30pm - 5.55pm
Part 3 - 11th January, 1975 @ 5.30pm - 5.55pm
Part 4 - 18th January, 1975 @ 5.30pm - 5.55pm
*Featuring the Fourth Doctor, Sarah, the Brigadier and UNIT, and introducing Harry Sullivan
*This story sees the introduction of a new opening title sequence and closing credits background, featuring Tom Baker and also the TARDIS, designed by Bernard Lodge and created using 'slit scan'
*Working title: 'The Robot'