 He played mutant bounty hunter Johnny Alpha, the Strontium Dog, in a series of Big Finish Productions audio plays based on the character from British comic "2000 AD".Pegg also appeared in Big Finish Productions' "Doctor Who" audio story "Invaders From Mars" as Don Chaney, and appeared in the "Doctor Who" television series, playing the Editor in the 2005 episode "The Long Game".He also narrated the first series of the "making-of" documentary series "Doctor Who Confidential".