Thandiwe Newton Ginger (voice) Zachary Levi Rocky (voice) Bella Ramsey Molly (voice) Imelda Staunton Bunty (voice) Lynn Ferguson Mac (voice) David Bradley Fowler (voice) Jane Horrocks Babs (voice) Romesh Ranganathan Nick (voice) Daniel Mays Fetcher (voice) Peter Serafinowicz Reginald Smith (voice) Nick Mohammed Dr Fry (voice) Miranda Richardson Mrs Tweedy (voice) David Brooks Burly Guard (voice) Sam Fell 2D Animated Boy / Dying Moth (voice) Naomi McDonald 2D Animated Mum / Beryl / Chicken 314 (voice)