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Roberts was a technician at the Wenley Moor nuclear research facility. While assisting in experiments with the cyclotron, Roberts fell under the influence of the Silurians and refused to shut it down. He attacked Phyllis Dawson when she tried shutting it down herself, but was knocked out by the Brigadier. (TV: Doctor Who and the Silurians)

Behind the scenes

In the novelisation, Roberts tries to strangle Liz Shaw in the cyclotron room, but is killed when Major Baker (Barker in the novelisation) hits Roberts with his revolver. He is also given the first name of George.