Yates sabotages the Doctor's equipment to stop him finding the location of Whitaker's base but then the tyrannosaur escapes, placing Sarah in danger.
Quest roles:
Richard Franklin(Mike Yates), Nicholas Courtney(Brig. Lethbridge-Stewart), Martin Jarvis(Governor), Noel Johnson(Charles Grover M.P.), John Levene(RSM Benton), John Bennett(Li H'sen Chang), Terence Wilton(Mark), Peter Miles(Nyder)