Stephen Moore is primarily a British stage actor who has nevertheless gained fame amongst science fiction fans as the voice of Marvin the Paranoid Android in the original radio version of The Hitchhiker's Guide to the Galaxy. Despite his association with audio science fiction, he did not appear in audio Doctor Who until the 2009 Eighth Doctor adventure contained in The Eight Truths and Worldwide Web, in which he voiced Clark Goodman. He later appeared as Eldane in the 2010 episodes The Hungry Earth and Cold Blood.