With Quinn dead, the Brigadier decides to take an armed party into the caves, prompting the Doctor to contact the Silurians himself.
Quest roles:
Nicholas Courtney(Brig. Lethbridge-Stewart), Norman Jones(Hieronymous), Pat Gorman(Pilot), Peter Halliday(Soldier), Paul Darrow(Tekker), Geoffrey Palmer(Administrator), Richard Steele(Sergeant Hart), Ian Talbot(Travis), Dave Carter(Roundhead Officer), Peter Miles(Nyder), Thomasine Heiner(Miss Dawson), Nigel John(Young Silurian), Paul Barton(Silurian), Simon Cain(Silurian), John Churchill(Silurian)