| Cast | Colin Baker (as The Doctor), Bonnie Langford (as Mel Bush), Lynda Bellingham (as The Inquisitor), Michael Jayston (as The Valeyard), Honor Blackman (as Professor Sarah Lasky), Malcolm Tierney (as Doland), David Allister (as Bruchner), Michael Craig (as Commodore Travers), Denys Hawthorne (as Rudge), Yolande Palfrey (as Janet), Arthur Hewlett (as Kimber), Sam Howard (2) (as Atza), Tony Scoggo (as Grenville / Enzu), Leon Davis (as Ortezo), Simon Slater (as Edwardes), Barbara Ward (as Mutant / Ruth Baxter), Peppi Borza (as First Vervoid), Bob Appleby (as Second Vervoid), Mike Mungarvan (as Duty Officer), Hugh Beverton (as Guard / First Guard), Martin Weedon (as Second Guard) |
