Helena Bonham Carter Jen (voice) Matthew Goode Raymond (voice) Claudie Blakley Penelope (voice) Paul Kaye Cosmos (voice) Miranda Richardson Aunt Clarice (voice) Mia Goth Mabel (voice) Will Sharpe Elias (voice) Susan Wokoma Rosa (voice) Mark Heap Mr. Thomas (voice) Stephanie Cole Great Aunt Eleanor (voice)