Thomas Brodie-Sangster

Firedrake (voice)

Freddie Highmore

Ben (voice)

Felicity Jones

Sorrell (voice)

Patrick Stewart

Nettlebrand (voice)

Sanjeev Bhaskar

Mad Doc (voice)

Nonso Anozie

Mighty Djinn (voice)

Meera Syal

Subisha Gulab (voice)

Alex Norton

Gravelbeard (voice)