He is the only actor to play both the "Doctor Who" character the Doctor and supply the voices of his greatest enemy, the Daleks. He played the former in numerous Audio Visuals audio dramas as well as the Big Finish audio drama Exile. He also played a man named Gideon Crane who mistakenly believed himself to be the Doctor in the Big Finish audio drama Minuet in Hell. He regularly supplies the voices of the Daleks in numerous audio dramas and episodes of "Doctor Who" (2005).
Appeared in Torchwood: Children of Earth