Arriving on Space Station Nerva in its distant past, the Doctor, Sarah and Harry find its crew threatened by a mysterious plague. Discovering that things are not as they seem, they uncover a Cyberman plot to destroy Voga, planet of gold.

Genres

Cast

Tom Baker

Doctor Who

Elisabeth Sladen

Sarah Jane Smith

Ian Marter

Harry Sullivan

Ronald Leigh-Hunt

Commander Stevenson

William Marlowe

Lester

Kevin Stoney

Tyrum

David Collings

Vorus

Michael Wisher

Magrik

Christopher Robbie

Cyber-Leader

Brian Grellis

Seprah