On screen
Cast
21 credited performers
Jon Pertwee
The Doctor
Caroline John
Liz Shaw
Nicholas Courtney
Brigadier Lethbridge-Stewart
Fulton Mackay
Dr. Quinn
Norman Jones
Major Baker
Peter Miles
Dr. Lawrence
Artwork unavailable
Thomasine Heiner
Miss Dawson
Artwork unavailable
John Newman
Spencer
Geoffrey Palmer
Masters
Artwork unavailable
Ian Cunningham
Dr. Meredith
Paul Darrow
Captain Hawkins
Artwork unavailable
Roy Branigan
Roberts
Artwork unavailable
Bill Matthews
Davis
Artwork unavailable
Nancie Jackson
Doris Squire
Artwork unavailable
Gordon Richardson
Squire
Artwork unavailable
Pat Gorman
Silurian
Artwork unavailable
Paul Barton
Silurian
Artwork unavailable
Simon Cain
Silurian
Artwork unavailable
John Churchill
Silurian
Artwork unavailable
Dave Carter
Silurian
Peter Halliday
Silurian (voices)