Gary Martin, born David Gary Grant, voiced Kohrbal in the Big Finish Doctor Who audio story Absolute Power. Martin's acting career dates back to the early 1980s, almost entirely consisting of voice acting roles. He made his stage debut at the age of eighteen, on a West End production of Jesus Christ Superstar. Martin is also a singer, having released six singles and once recorded with Queen.
He's long been a popular candidate for voiceover on film trailers. For example, he was the voice of J.K. Rowling's Fantastic Beasts and Where to Find Them trailer campaign. Gary Martin is also the universal voice of "Captain Aquafresh", Aquafresh's superhero mascot.