All Cast
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