Bella Ramsey

as Hilda (voice)

Ameerah Falzon-Ojo

as Frida (voice)

Oliver Nelson

as David (voice)

Daisy Haggard

as Johanna (voice)

Rasmus Hardiker

as Alfur Aldric (voice)

John Hopkins

as Erik Ahlberg (voice)

Lucy Montgomery

as Gerda Gustav (voice)

Dino Kelly

as Trundle (voice)

Rachel August

as Trylla (voice)

Agnes Peacok

as Baba (voice)

Harriet Turnbull

as Additional Voices (voice)