William Hartnell as The Doctor

Jacqueline Hill as Barbara Wright

William Russell as Ian Chesterton

Maureen O'Brien as Vicki

Peter Sanders as Sita

Peter Craze as Dako

Bill Starkey as Third Xeron / Xeron

Richard Shaw as Lobos

Jeremy Bulloch as Tor

Salvin Stewart as Morok Messenger / Morok Guard

Peter Diamond as Morok Technician / Morok Guard

Lawrence Dean as Morok Guard

Ken Norris as Morok Guard

Ivor Salter as Morok Commander

Michael Gordon as Xeron

Edward Granville as Xeron

David Wolliscroft as Xeron

Billy Cornelius as Morok Guard

Peter Hawkins as Dalek (voice)

Murphy Grumbar as Dalek