- James Corden - Bran - Thunderdell's Son
- JJ Feild - Young Jack
- Jonathan Hyde - Dussan
- Anton Lesser - Vidas Merlinis
- Julia McKenzie - Jack's Mum
- Clare Angelini Heather - Wedding Guest (uncredited)
- Nicholas Beveney - Cernos
- Roger Blake - Giant Thor
- Mel Cobb - Journalist
- Frank Baker - Forensic Doctor
- Josh Cole - Operator #1
- Richard Cubison - Curious Patron
- Leo Dolan - Construction Foreman
- Tom Ellis - Bigger Boy #1
- Oliver Ford Davies - Dr. Newman
- Jerry Harte - Board Member
- Richard Huw - Jack's Father
- Rosalind Knight - Hag Woman
- Joseph Long - Antonio
- Adam Fogerty - Lead Warrior
- Marc Goodhall - Cavern Guard
- Andrew Grainger - Armed Policeman
- Peter Guinness - Hall Cryer
- Sam Halpenny - Taxi Driver
- Edward Highmore - Playground Dad
- Freddie Highmore - Playground Son
- Lisa Kay - Security Woman
- Vincent Marzello - Sprague
- Roger Morlidge - Construction Worker #2
- Carl Pizzie - Operator #2
- David J. Nicholls - Ragnar
- Iain Rogerson - Guard
- Lynda Rooke - Hostess
- Cyril Shaps - Bent Little Man
- Rachel Shelley - Brunette
- Alisdair Simpson - Paramedic
- Jason Thorpe - Maitre D'
- Brian Henson - Galaga (voice)
- Glen Davies - Construction Worker #1
- Brian Henson
- James V. Hart
- Bill Barretta
- Martin G. Baker
Freddie Highmore interpreta a Playground Son en la serie.
Bill Barretta interpreta a Thunderdell en la serie.
Rosalind Knight interpreta a Hag Woman en la serie.
Adam Fogerty interpreta a Lead Warrior en la serie.
Matthew Modine hace el papel de Jack Robinson.
Vanessa Redgrave hace el papel de Countess Wilhelmina.
Mia Sara interpreta a Ondine en la serie.
Daryl Hannah interpreta a Thespee en la serie.
Jon Voight hace el papel de Siggy.
Richard Attenborough interpreta a Magog en la serie.
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