• 
  Brian Henson

  regizor

• 
  Brian Henson

  scenarist

• 
  Matthew Modine

  Jack Robinson
• 
  Vanessa Redgrave

  Contesa Wilhelmina
• 
  Jon Voight

  Siggy (Sigfried Mannheim)
• 
  Julia McKenzie
• 
  Freddie Highmore
• 
  Jim Carter

  Odin, Member of Great Council of Mac Slec

• 
  Adam Fogerty

  Forensic Doctor
• 
  Daryl Hannah

  Thespee, Member Great Council of Mac Slec
• 
  Richard Attenborough

  Magog, Arbiter of Justice Great Council of Mac Slec
• 
  Jonathan Hyde

  Dussan, Jack's Butler/Guardian
• 
  Andrew Grainger

  Armed Policeman
• 
  Honor Blackman

  Jules, Jack's Secretary
• 
  Mia Sara

  Ondine

• 
  Anton Lesser

  Vidas Merlinis, Research Scientist
• 
  Peter Guinness

  Hall Cryer
• 
  Lisa Kay

  Security Woman
• 
  Brian Henson

  Galaga
• 
  Cyril Shaps

  Bent Little Man
• 
  Bill Barretta

  Thunderdell
• 
  Rachel Shelley

  Harmonia
• 
  JJ Feild

  Young Jack
• 
  James Corden

  Bran, Thunderdell's Son
• 
  Frank Baker

   Forensic Doctor (2 episodes, 2001)
• 
  Nicholas Beveney

   Cernos - Member of Great Council of Mac Slec (2 episodes, 2001)
• 
  Roger Blake

   Giant Thor - Member of Great Council of Mac Slec (2 episodes, 2001)
• 
  Mel Cobb

   Journalist (2 episodes, 2001)
• 
  Josh Cole

   Operator 1 (2 episodes, 2001)
• 
  Richard Cubison

   Curious Patron (2 episodes, 2001)
• 
  Oliver Ford Davies

   Dr. Newman (2 episodes, 2001)
• 
  Leo Dolan

   Construction Foreman (2 episodes, 2001)
• 
  Tom Ellis

   Bigger Boy 1 (2 episodes, 2001)
• 
  Sam Halpenny

   Taxi Driver (2 episodes, 2001)
• 
  Jerry Harte

   Board Member (2 episodes, 2001)
• 
  Edward Highmore

   Dad at Playground (2 episodes, 2001)
• 
  Richard Huw

   Jack's Father (2 episodes, 2001)
• 
  Rosalind Knight

   Hag Woman (2 episodes, 2001)
• 
  Joseph Long

   Antonio the Baker (2 episodes, 2001)
• 
  Vincent Marzello

   Mr. Sprague - Head of Security (2 episodes, 2001)
• 
  Roger Morlidge

   Construction Worker 2 (2 episodes, 2001)
• 
  David Nicholls

   Ragnar, Executioner (2 episodes, 2001)
• 
  Carl Pizzie

   Operator 2 (2 episodes, 2001)
• 
  Iain Rogerson

   Guard (2 episodes, 2001)
• 
  Lynda Rooke

   Hostess (2 episodes, 2001)
• 
  Lolly Susi

   Miss Gilgin (2 episodes, 2001)
• 
  Jemma Woodman

   Newsreader (2 episodes, 2001)
• 
  Jason Thorpe

   Maitre D' (2 episodes, 2001)
• 
  Marc Goodhall

   Cavern Guard (2 episodes, 2001)
• 
  Glen Davies

   Construction Worker 1 (2 episodes, 2001)
• 
  Alisdair Simpson

   Paramedic (2 episodes, 2001)
• 
  Craig Stoke

   Limo Driver (2 episodes, 2001)
• 
  Tomas Shepherd

   Jack aged 6 (2 episodes, 2001)
• 
  Fraser Flintham

   Bigger Boy 2 (2 episodes, 2001)