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.
as The Doctor
as Sarah Jane Smith
as Dan Galloway
as Richard Railton
as Jill Tarrant
as Peter Hamilton
as Commander Stewart
as Bellal
as Gotal
as High Priest
as Dalek Voices
as Dalek
as Dalek
as Dalek
