Garrick Hagon played Ky in the Doctor Who television story The Mutants, Abraham in the Doctor Who television story A Town Called Mercy and The Jester in the Big Finish Doctor Who audio story The Axis of Insanity. He also provided the uncredited Skybase One tannoy voice in The Mutants. (DWM 230)
He is perhaps more famous for a smaller role, however. He played Luke Skywalker's friend, Biggs, in the original Star Wars movie.
He provided commentary for The Mutants 2011 DVD release in episodes two, four and six.
