Clay Martin Croker (January 10, 1962 – September 17, 2016), generally billed as C. Martin Croker, was an American animator and voice actor. He is best known for having provided the voices of Zorak and Moltar on the animated series Space Ghost Coast to Coast, replacing Don Messick, who originally voiced the characters in the 1960s series Space Ghost.
Due to the lack of animation from the 60's Space Ghost series, Croker was brought in to provide extra animation, such as Space Ghost tapping his index cards on his desk. He also is responsible for many of the show's touchstones, such as it's setting in outer space, and Zorak and Moltar's roles as Space Ghost's unwilling prisoners.
- "15 Things You Might Not Know About Space Ghost Coast to Coast by Roger Cormier, Mental Floss, April 27, 2015