Guest Stars Anthony Ainley as The Master Michael Cashman as First Officer Bilton Richard Easton as Captain Stapley Keith Drinkel as Flight Engineer Scobie Judith Byfield as Angela Clifford Mykel Mills as Plasmaton (uncredited) Anthony Ainley as Kalid Brian McDermott as Sheard Peter Dahlsen as Horton Peter Cellier as Andrews John Flint as Captain Urquhart