The Doctor is rescued from Finch by the Brigadier and Benton and tries to persuade them to stop Grover before millions of people are erased from history.
Quest roles:
Richard Franklin(Mike Yates), Nicholas Courtney(Brig. Lethbridge-Stewart), Martin Jarvis(Governor), Carmen Silvera(Queen of Hearts), Noel Johnson(King Thous), John Levene(Sergeant Benton), Colin Bell(C.P.O. Summers), John Bennett(Li H'sen Chang), Terence Wilton(Mark), Brian Badcoe(Adam), Timothy Craven(Short), Peter Miles(Dr. Lawrence)