Guest Stars John Newman as Spencer Bill Matthews as Davis Geoffrey Palmer as Masters Brendan Barry as Hospital Doctor John Churchill as Silurian Ian Cunningham as Dr. Meredith Nigel Johns as Young Silurian Gordon Richardson voices 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 Ian Talbot as Travis 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 Paul Darrow as Captain Hawkins Fulton Mackay as Dr. Quinn Thomasine Heiner as Miss Dawson