Matthew Goode as David

Pippa Haywood as Bookshop Owner

Paula Patton as Alice

Michael Caine as Psammead (voice)

Russell Brand as Tristan Trent

William Franklyn-Miller as Carl

Billy Jenkins as Robbie

Ashley Aufderheide as Smash

Jacqueline Wilson as Herself

Teddie Allen as Ros

Ellie-Mae Siame as Maudie

Cheryl as Coco Rayne

Paul Bazely as Sgt. Gascoigne

Caroline Sheen as Jenny