The Master enlists the help of Krasis to control Kronos while Yates tries to bring the TARDIS to the institute only to come under attack from dangers from the past.
Quest roles:
Richard Franklin(Mike Yates), Nicholas Courtney(Brig. Lethbridge-Stewart), John Levene(Sergeant Benton), Dave Carter(Roundhead Officer), Roger Delgado(The Master), Wanda Moore(Dr. Ruth Ingram), Ian Collier(The Renegade (voice)), John Wyse(Dr. Percival), Donald Eccles(Krasis), Aidan Murphy(Hippias), Simon Legree(UNIT Sergeant), Marc Boyle(Kronos), George Cormack(Dalios), Greg Powell(Knight)