Gary Chalk is a British-born Canadian actor and voice actor. He was involved in professional theatre since 1978. Most of his career has been in film and television. Television series he's appeared in include Cold Squad and Stargate SG-1. He's done voiceovers for such animated shows as the 2002 remake of He-man and the Masters of the Universe and Transformers: Beast Wars. He's also appeared in Adventures of Sonic the Hedgehog as Grounder and Sonic Underground as Dr. Robotnik.