Cast
- Paul Jones
- The Doctor
- Lalla Ward
- Romana
- John Leeson
- K9
- David Brierly
- K9
- Christopher Neame
- Skagra
- Denis Carey
- Chronotis
- Steven O'Donnell
- Chronotis
- Daniel Hill
- Chris Parsons
- Tom Baker
- The Doctor
- Victoria Burgoyne
- Clare Keightley
- Gerald Campion
- Wilkins
- Graham Cole
- Krarg 2
- James Coombes
- Krarg
- Shirley Dixon
- Voice of computer
- Harry Fielder
- Krarg 3
- John Hallet
- Police Constable
- Derek Pollitt
- Professor Caldera
