Jeremy Irons
— Mi (voice)
Alicia Vikander
— Huppu (voice)
Jim Broadbent
— Horozovich (voice)
Khalid Abdalla
— Bat (voice)
Sheridan Smith
— Gavra (voice)
Kevin Bishop
— Hassan (voice)
Christopher Villiers
— Craven (voice)
Ella Smith
— Tifa (voice)
Michele Austin
— Jula (voice)
Mark Spencer
— Bird Police (voice)
Jay Villiers
— Wise Bird 1 (voice)
Dan Stevens
— Wise Bird 2 (voice)
Oliver Villiers
— Mean Chick (voice)
Janine Wetherall
— Other Chicks (voice)
Noah Harthstone-Kolovich
— Other Chicks (voice)
Lola Harthstone-Kolovich
— Other Chicks (voice)
Eli Harthstone-Kolovich
— Other Chicks (voice)
Antonia Roupell
— Hens (voice)
Harriet Barrow
— Hens (voice)
Catriona Paterson
— Hens (voice)