Ruby Barnhill

as Princess Emmy (voice)

Franka Potente

as Queen Karla (voice)

John Hannah

as King Karl (voice)

Tim McInnerny

as Gregorius the Ghost (voice)

Bella Ramsey

as Princess Gizana (voice)

Kenny Blyth

as Additional Voices

Uwe Ochsenknecht

as Vincenzo Massimo Cerimonata (voice)

Tyler Collins

as Additional Voices

Michael Daviot

as Xaver (voice)

Joel Fry

as Ceasar (voice)

Christina Gordon

as Additional Voices

Al Hawkinson

as Paul (voice)

Robert Jack

as Sebastian April (voice)

Nathan Mack

as David (voice)

Scarlett Mack

as Additional Voices

Steven McNicholl

as Vincenzo (voice)

Euan Mitchell

as Moritz (voice)

James Anthony Pearson

as Donny / Valentine (voice)

Gabriel Quigley

as Frau Zwickelmeier / Daphne (voice)

Vari Sylvester

as Marie (voice)

Claire Waugh

as Fionnuala Bloom (voice)