The Doctor and Sarah return to London in the present day only to find the city strangely deserted, while nearby UNIT are dealing with a series of monster appearances.
Quest roles:
Richard Franklin(Mike Yates), Nicholas Courtney(Brig. Lethbridge-Stewart), Terry Walsh(Doran (uncredited)), John Levene(Sergeant Benton), Dave Carter(Sergeant Duffy), Martin Taylor(Corporal Norton), John Bennett(General Finch), Ben Aris(Lieutenant Shears), George Bryson(Private Ogden), Gordon Reid(Phillips), Trevor Lawrence(Lodge), John Caesar(R/T Soldier), Cy Town(Haemovore (uncredited))