Attempting to find out where Jo encountered the Master, the Doctor heads to the circus where he falls foul of Rossini.
Quest roles:
Richard Franklin(Mike Yates), Nicholas Courtney(Brig. Lethbridge-Stewart), Terry Walsh(Doran (uncredited)), Roy Stewart(Strong Man), John Levene(Sergeant Benton), Harry Towb(McDermott), Michael Wisher(Daleks (voice)), Roger Delgado(The Master), Christopher Burgess(Professor Philips), John Baskcomb(Rossini), Stephen Jack(Farrell Senior), Barbara Leake(Mrs. Farrel)