"The newly-regenerated Doctor helps UNIT battle a sentient robot being manipulated by a corrupt scientific organization."
Tom Baker
as The Doctor
Elisabeth Sladen
as Sarah Jane Smith
Ian Marter
as Harry Sullivan
Nicholas Courtney
as Brigadier Lethbridge-Stewart
John Levene
as RSM Benton
Patricia Maynard
as Miss Winters
Michael Kilgarriff
as The Robot
Edward Burnham
as Professor Kettlewell
Alec Linstead
as Jellicoe
Timothy Craven
as Short
Clive Barrie
as Phillips
Walter Goodman
as Joseph Chambers
Jon Pertwee
Christopher Barry
Director
Dudley Simpson
Original Music Composer
Terrance Dicks
Writer
Barry Letts
Producer
Robert Holmes
Script Editor
Trevor Webster
Sound
Peter Grimwade
Production Assistant
Nigel Wright
Lighting Director
James Acheson
Costume Design
Vic Godrich
Dick Mills
Special Sound Effects
Clifford Culley
Visual Effects
Ian Rawnsley
Production Design
John Mason
Judy Clay
Makeup Artist
John Holmes
George Gallaccio
Production Manager
Delia Derbyshire
Theme Song Performance