William Hartnell Dr. Who Actor Peter Purves Steven Taylor Actor Jean Marsh Sara Kingdom Actor Clifford Earl Station Sergeant Actor Norman Mitchell First Policeman Actor Malcolm Rogers Second Policeman Actor Kenneth Thornett Detective-Inspector Actor Reg Pritchard Man in Mackintosh Actor Sheila Dunn Blossom Lefavre Actor Leonard Grahame Darcy Tranton Actor Royston Tickner Steinberger P. Green Actor Conrad Monk Assistant Director Actor David James Arab Sheikh Actor Robert Jewell Clown Actor Bryan Mosley Prop Man Actor Stephen Machin Cameraman Actor Paula Topham Vamp Actor Albert Barrington Professor Webster Actor John Wiles Producer Douglas Camfield Director Terry Nation Writer