Thandiwe Newton Ginger (voice) Zachary Levi Rocky (voice) Bella Ramsey Molly (voice) Jane Horrocks Babs (voice) Imelda Staunton Bunty (voice) David Bradley Fowler (voice) Romesh Ranganathan Nick (voice) Daniel Mays Fetcher (voice) Nick Mohammed Dr. Fry (voice) Peter Serafinowicz Reginald Smith (voice) Miranda Richardson Mrs. Tweedy (voice)