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 Nigel Johns as Young Silurian Peter Miles as Dr. Lawrence Ian Talbot as Travis Paul Darrow as Captain Hawkins Alan Mason as Corporal Nutting Ian Cunningham as Dr. Meredith Brendan Barry as Hospital Doctor John Churchill as 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 Nancie Jackson as Doris Squire Peter Halliday as Silurian Voices Fulton Mackay as Dr. Quinn Thomasine Heiner as Miss Dawson
