Calificación
Reparto

Jon Pertwee
The Doctor

Katy Manning
Jo Grant

David Troughton
Peladon

Geoffrey Toone
Hepesh

Henry Gilbert
Torbis

Alan Bennion
Izlyr

Sonny Caldinez
Ssorg

Stuart Fell
Alpha Centauri

Ysanne Churchman
Alpha Centauri (voice)

Nick Hobbs
Aggedor

Murphy Grumbar
Arcturus

Terry Bale
Arcturus (voice)

Gordon Stothard
Grun

George Giles
Guard Captain

Wendy Danvers
Amazonia