Guest Stars Lynda Bellingham as The Inquisitor Michael Jayston as The Valeyard Malcolm Tierney as Doland Honor Blackman as Professor Lasky Yolande Palfrey as Janet Sam Howard as Azta Arthur Hewlett as Kimber Denys Hawthorne as Rudge Michael Craig as Commodore Travers Leon Davis as Ortezo David Allister as Bruchner Richard Bonehill as Hyperion III Officer Tony Scoggo as Grenville Hugh Beverton as Guard Tony Scoggo as Enzu Uncredited Robert Goodman as Hyperion III Officer Robert Goodman as Loader
