Thomas Brodie-Sangster as Firedrake (voice)

Freddie Highmore as Ben (voice)

Felicity Jones as Sorrell (voice)

Patrick Stewart as Nettlebrand (voice)

Sanjeev Bhaskar as Mad Doc (voice)

Nonso Anozie as Mighty Djinn (voice)

Meera Syal as Subisha Gulab (voice)

Alex Norton as Gravelbeard (voice)

Peter Marinker as Slatebeard (voice)

Stephen Hogan as Spinecrackle (voice)

Glenn Wrage as Bottleneck (voice)

Eric Meyers as Sulphurbreath (voice)

William Vanderpuye as Stonebeard (voice)

David Brooks as Professor Greenbloom (voice)

Ewan Bailey as Sorrel's Dad (voice)

Alison Dowling as Sorrel's Mom (voice)

Glen McCready as Granitface (voice)

Jimmy Hilbbert as Twigleg (voice)