The Doctor and Jamie are captured by the Dominators, who subject them to an intelligence test, while Zoe and Cully attempt to convince the Dulcian council of the threat.
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), Felicity Gibson(Kando), Giles Block(Teel), Johnson Bayly(Balan), John Hicks(Axon Boy), Sheila Grant(Jane Leeson)