An energy drain traps the Third Doctor and Sarah Jane Smith on the planet Exxilon with its hostile natives, causing the travellers to make an uneasy alliance with a Marine Space Corps expedition and a squadron of Daleks. The key to escape for all of them lies at the heart of a powerful and mysterious lost city, but only after a series of deadly traps.
Cast
Jon Pertwee
The Doctor
Elisabeth Sladen
Sarah Jane Smith
Duncan Lamont
Dan Galloway
John Abineri
Richard Railton
Joy Harrison
Jill Tarrant
Julian Fox
Peter Hamilton
Neil Seiler
Commander Stewart
Arnold Yarrow
Bellal
Roy Heymann
Gotal
Mostyn Evans
High Priest
Michael Wisher
Dalek Voices
John Scott Martin
Dalek
Murphy Grumbar
Dalek
Cy Town
Dalek
Crew
Michael E. Briant
Director
Terry Nation
Writer
Terrance Dicks
Script Editor
Bob Rymer
Editor
Barry Letts
Producer
Colin Green
Production Design
L. Rowland-Warne
Costume Design
Richard Chubb
Sound
Jim Ward
Visual Effects
Carey Blyton
Original Music Composer
Dick Mills
Special Sound Effects
Delia Derbyshire
Theme Song Performance
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