| Cast | Tom Baker (as The Doctor), Elisabeth Sladen (as Sarah Jane Smith), Tony Beckley (as Harrison Chase), Kenneth Gilbert (2) (as Richard Dunbar), Michael Barrington (as Sir Colin Thackeray), Sylvia Coleridge (as Amelia Ducat), John Challis (as Scorby), Mark Jones (2) (as Arnold Keeler), Seymour Green (as Hargreaves), Michael McStay (as Derek Moberley), Hubert Rees (as John Stevenson), John Gleeson (as Charles Winlett), Ian Fairbairn (as Doctor Chester), John Acheson (as Major Beresford), Ray Barron (as Sergeant Henderson), Alan Chuntz (as Chauffeur), David Masterman (as Guard Leader), Harry Fielder (as Guard) |
