Cast

• Peter Davison (The Doctor)
• Sarah Sutton (Nyssa)
• Anneke Wills (Polly Wright)
• Russell Floyd (Gerry Lenz)
• Nicholas Courtney (Sir Alistair Lethbridge-Stewart)
• John Pickard (Thomas Brewster)
• Keith Barron (Isaac Barclay)
• Liza Tarbuck (Lysette Barclay)
• Richenda Carey (Alexis Linfoot)
• Barry McCarthy (Vincent Linfoot)
• Richard Cordery (Professor Rinxo Jabbery)
• Susan Brown (Mrs Withers / Mrs Sowerby / Computer / Conditioned Human)
• David Dobson (Dobson / Cricketer / Conditioned Human)
• Nicholas Briggs (The Daleks)