Jon Pertwee

The Doctor

Elisabeth Sladen

Sarah Jane Smith

Nina Thomas

Queen Thalira

Frank Gatliff

Chancellor Ortron

Rex Robinson

Gebek

Ralph Watson

Ettis

Graeme Eton

Preba

Michael Crane

Blor

Terry Walsh

Guard Captain

Max Faulkner

Miner

Roy Evans

Miner

Nick Hobbs

Aggedor

Donald Gee

Eckersley

Stuart Fell

Body of Alpha Centauri

Ysanne Churchman

Voice of Alpha Centauri

Lennie Mayne