Ardal O'Hanlon as Robbie (voice)

Jane Horrocks as Donner (voice)

Gillian Anderson as Queen Vorkana (voice)

Keira Knightley as Em (voice)

Ozzy Osbourne as Vicar (voice)

Michael Palin as Gariiiiiii (voice)

Paul Whitehouse as Prancer (voice)

Sean Hughes as Tapir (voice)

Harry Enfield as Old Jingle (voice)

Graham Norton as Computer (voice)

Russell Brand as Earth Guardian (voice)

Shane Richie as Trooper #1 (voice)

Ross Kemp as Trooper #2 (voice)