Zoe and Cully are captured by the Dominators and put to work alongside the survey team while the Doctor and Jamie decide to return to the island to help.
Quest roles:
Ronald Allen(Ralph Cornish), Arthur Cox(Cully), Gary Smith(Quark), Freddie Wilson(Quark), Kenneth Ives(Toba), Walter Fitzgerald(Senex), Alan Gerrard(Bovem), John Cross(Council Member), Ronald Mansell(Council Member), Brian Cant(Tensa), Felicity Gibson(Kando), Giles Block(Teel), Johnson Bayly(Balan), John Hicks(Axon Boy), Sheila Grant(Jane Leeson)