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