UNIT retrieve the returned Recovery 7 but then Carrington hijacks it while the Doctor and Liz try to decode the signal he sent.
Quest roles:
Nicholas Courtney(Brig. Lethbridge-Stewart), John Abineri(Ranquin), Ronald Allen(Ralph Cornish), Michael Wisher(Daleks (voice)), Robert Cawdron(Taltalian), Ric Felgate(Astronaut), Cheryl Molineaux(Miss Rutherford), Ray Armstrong(Grey), Robert Robertson(Collinson), Dallas Cavell(Quinlan), Bernard Martin(Control Room Assistant), James Haswell(Corporal Champion), Derek Ware(Pigbin Josh), John Moreno(Dobson)