The Doctor discovers an Interplanetary Mining Corporation ship has landed on the planet in order to mine its duralinium, while Norton begins causing trouble at the colony.
Quest roles:
John Scott Martin(Dalek Operator), John Ringham(Josiah Blake), Bernard Kay(Caldwell), Roy Skelton(Daleks (voice)), Pat Gorman(Pilot), Helen Worth(Mary Ashe), Morris Perry(Dent), Tony Caunter(Jackson), John Herrington(Holden), Nicholas Pennell(Winton)