Ηθοποιοί επεισοδίου
Patrick TroughtonThe Doctor
William HartnellThe Doctor
Anneke WillsPolly
Michael CrazeBen
Robert BeattyGeneral Cutler
★
Dudley JonesDyson
★
David DodimeadBarclay
Steve PlytasWigner
★
Christopher MatthewsRadar Technician
Reg WhiteheadJarl
★
Harry BrooksKrang
★
Gregg PalmerGern
★
Ellen CullenGeneva Technician
Roy SkeltonCyberman (voice)