 He did voice work for the BBC Radio 2 series "Flight of the Conchords", first broadcast in September 2005.Proops also played the title role in BBC Radio 4's sci-fi comedy series "Seymour the Fractal Cat".Proops was in the cast of "Tim Burton's The Nightmare Before Christmas" soundtrack and movie, providing the voice for the Harlequin Demon, the Devil, and the Sax Player.