Toby Kebbell as Terry Dexter (voice)

Lily Collins as Princess Dawn (voice)

Ian McShane as The Grump (voice)

Keith Wickham as GP Sparrow / Dingo / Mitch (voice)

David Holt as Bip (voice)

Rasmus Hardiker as Balloon Herald 1 / Prince Charming (voice)

Emma Tate as Grandma Mary / Nanny Bear (voice)

Amy Thompson as Mary / Old Woman / Whispering Orchids (voice)

Jay Britton as Grumpies / Caveman / Thelonious (voice)

Andres Williams as Chancellor Woodblock (voice)

Claire Morgan as Fashion Manager (voice)

Paul Tylak as Oracle / Balloon Herald 2 / Red Bird (voice)

Darren Altman as Robert (voice)

Inel Tomlinson as Prime Pine / Air Doll / Generic Balloon 1 (voice)

Sophie Aldred as Crowd (voice)