The Rani has returned with another malicious scientific scheme. Taking advantage of the post-regenerative trauma the recently regenerated and unstable Doctor is going through, she hopes to achieve control of an approaching asteroid composed entirely of strange matter. Can the Doctor figure out he is being used for the Rani's evil experiment, and what is behind the door the Rani won't allow him past?
Sylvester McCoy
as The Doctor
Bonnie Langford
as Mel Bush
Kate O'Mara
as The Rani
Mark Greenstreet
as Ikona
Wanda Ventham
as Faroon
Donald Pickering
as Beyus
Karen Clegg
as Sarn
Richard Gauntlett
as Urak
John Segal
as Lanisha
Peter Tuddenham
as Special Voices (voice)
Jacki Webb
as Special Voices (voice)
