Guest Stars John Newman as Spencer Bill Matthews as Davis Pat Gorman as Silurian Pat Gorman as Silurian Scientist Geoffrey Palmer as Masters Alan Mason as Corporal Nutting Norman Jones as Major Baker Dave Carter as Silurian Dave Carter as Old Silurian Gordon Richardson as Squire Ian Talbot as Travis Paul Darrow as Captain Hawkins Peter Halliday as Silurian Voices John Churchill as Silurian Nigel Johns as Young Silurian Simon Cain as Silurian Thomasine Heiner as Miss Dawson Paul Barton as Silurian Richard Steele as Sergeant Hart Roy Branigan as Roberts David Pollitt as Private Wright Harry Swift as Private Robins Brendan Barry as Hospital Doctor Peter Miles as Dr. Lawrence Nancie Jackson as Doris Squire Ian Conningham as Dr. Meredith Fulton Mackay as Dr. Quinn Keith Ashley as Technician Bernard Barnsley as UNIT Soldier Jim Delaney as UNIT Soldier Joan Harsant as Technician Brian Nolan as UNIT Soldier
