Guest Stars John Newman as Spencer Bill Matthews as Davis Ian Talbot as Travis Pat Gorman as Silurian Scientist Pat Gorman as Silurian Norman Jones as Major Baker Nigel Johns as Young Silurian Geoffrey Palmer as Masters Paul Darrow as Captain Hawkins Alan Mason as Corporal Nutting Ian Cunningham as Dr. Meredith Brendan Barry as Hospital Doctor Gordon Richardson as Squire John Churchill as Silurian 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 Peter Miles as Dr. Lawrence Nancie Jackson as Doris Squire Peter Halliday as Silurian Voices Fulton Mackay as Dr. Quinn Thomasine Heiner as Miss Dawson
