Guest Stars John Newman as Spencer Bill Matthews as Davis Geoffrey Palmer as Masters Norman Jones as Major Baker Pat Gorman as Silurian Scientist Pat Gorman as Silurian Dave Carter as Old Silurian Dave Carter as Silurian Ian Talbot as Travis Paul Darrow as Captain Hawkins Peter Halliday as Silurian Voices Alan Mason as Corporal Nutting 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 Peter Miles as Dr. Lawrence Nancie Jackson as Doris Squire Fulton Mackay as Dr. Quinn Thomasine Heiner as Miss Dawson
