Tom Baker as The Doctor

Lalla Ward as Romana (voice)

David Brierly as K9 (archive footage) (voice)

Christopher Neame as Skagra (voice)

Daniel Hill as Chris Parsons (voice)

Denis Carey as Professor Chronotis (archive footage)

Victoria Burgoyne as Clare Keightley (voice)

Gerald Campion as Wilkin (archive footage)

Shirley Dixon as The Ship (voice)

Derek Pollitt as Dr. Caldera (archive footage)

James Coombes as The Krargs (voice)

John Hallet as Police Constable

David Strong as Man in Car (archive footage)

James Muir as Fisherman (archive footage)

Derek Suthern as Krarg

Barnaby Edwards as Krarg

Tim Bentinck as The Doctor (body double)

Toby Hadoke as Continuity Announcer (voice)