Richard Hope played the Silurian scientist Malohkeh in the Doctor Who stories The Hungry Earth, Cold Blood and The Wedding of River Song. He later played another Silurian, Bleytal, in Dinosaurs on a Spaceship. For Big Finish Productions, he voiced William Heaton in Changing of the Guard, Moreland in The Bounty of Ceres, and Harry Harvey in Damaged Goods. He returned to the world of Silurians in UNIT: The New Series appearing in Series 4 Assembled as the radical leader Jastrok and ex-UNIT squaddie Terry Waring.