Cast (12)
Peter DavisonThe Doctor
Janet FieldingTegan Jovanka
Mark StricksonVislor Turlough
Cyril LuckhamThe White Guardian
Valentine DyallThe Black Guardian
Keith BarronStrikerChristopher BrownMarriner
Lynda BaronWrack
Leee JohnMansellJames McClureFirst Officer
Tony CaunterJackson
Clive KnellerCollier