The Doctor attempts to solve the mystery of the monster invasion. His first move - the capture of a dinosaur.
Quest roles:
Richard Franklin(Mike Yates), Nicholas Courtney(Brig. Lethbridge-Stewart), Martin Jarvis(Governor), Noel Johnson(Charles Grover M.P.), Pat Gorman(Pilot), John Levene(Sergeant Benton), John Bennett(Li H'sen Chang), George Bryson(Private Ogden), James Marcus(Rask), Peter Miles(Nyder)