"Sontaran Field Major Styre is conducting experiments on the survivors of future Earth in preparation of a full-scale Sontaran invasion of the planet. Can the Doctor defeat Styre and save the world?"
Tom Baker
as The Doctor
Elisabeth Sladen
as Sarah Jane Smith
Ian Marter
as Harry Sullivan
Kevin Lindsay
as Styre / The Marshal
Donald Douglas
as Vural
Glyn Jones
as Krans
Peter Walshe
as Erak
Peter Rutherford
as Roth
Terry Walsh
as Zake
Brian Ellis
as Prisoner
Rodney Bennett
Director
Bob Baker
Writer
Dave Martin
Robert Holmes
Script Editor
Philip Hinchcliffe
Producer
Dudley Simpson
Original Music Composer
Marion McDougall
Production Assistant
Dick Mills
Special Sound Effects
John Friedlander
Visual Effects
Tony Oxley
Barbara Kidd
Costume Design
Sylvia James
Makeup Artist
Tommy Thomas
Lighting Director
Vic Godrich
Sound
Roger Murray-Leach
Production Design
Fight Choreographer
George Gallaccio
Production Manager
Delia Derbyshire
Theme Song Performance