Guest Stars John Newman as Spencer Bill Matthews as Davis Geoffrey Palmer as Masters Pat Gorman as Silurian Pat Gorman as Silurian Scientist Paul Darrow as Captain Hawkins Brendan Barry as Hospital Doctor John Churchill as Silurian Ian Cunningham as Dr. Meredith 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 Ian Talbot as Travis Peter Miles as Dr. Lawrence Nancie Jackson as Doris Squire 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
