The Silurians contact Quinn for help in retrieving the creature while the Doctor and the Brigadier organise a search of the moors.
Quest roles:
Nicholas Courtney(Brig. Lethbridge-Stewart), Norman Jones(Khrisong), Pat Gorman(Pilot), Fulton Mackay(Dr. Quinn), Paul Darrow(Tekker), Peter Miles(Nyder), Thomasine Heiner(Miss Dawson)