Guest Stars John Newman as Spencer Bill Matthews as Davis Geoffrey Palmer as Masters Peter Miles as Dr. Lawrence John Churchill as Silurian Nigel Johns as Young Silurian Gordon Richardson as Squire Simon Cain as Silurian Paul Barton as Silurian Richard Steele as Sergeant Hart Roy Branigan as Roberts David Pollitt as Private Wright Harry Swift as Private Robins Dave Carter as Silurian Dave Carter as Old Silurian Brendan Barry as Hospital Doctor Ian Talbot as Travis Nancie Jackson as Doris Squire Pat Gorman as Silurian Scientist Pat Gorman as Silurian Norman Jones as Major Baker Ian Conningham as Dr. Meredith Alan Mason as Corporal Nutting Peter Halliday as Silurian Voices Paul Darrow as Captain Hawkins Fulton Mackay as Dr. Quinn Thomasine Heiner as Miss Dawson Bella Emberg as Nurse