Rory Kinnear
Bedford
Mark Gatiss
Cavor
Alex Riddell
Jim
Reece Shearsmith
Moon
Lee Ingleby
Chessocks
Peter Forbes
Dad
Steve Pemberton
Sun
Philip Jackson
Voice of Grand Lunar
Julia Deakin
Mrs Fitt
Katherine Jakeways
Mum
Ian Hallard
Voice of Phi-Oo
Richard Rosson
Selenite (uncredited)
