Travis Knight Director, Producer Peyton Elizabeth Lee Prue McKeel Voice Jacob Tremblay Curtis Voice Carey Mulligan Alexandra Voice Mahershala Ali Brendan Voice Angela Bassett The General Voice Awkwafina Septima Voice Jake Johnson Mr. McKeel Voice Charlie Day Dmitri Voice Amandla Stenberg Niamh Voice Jemaine Clement Roger Voice Maya Erskine Mrs. McKeel Voice Tantoo Cardinal Iphigenia Voice Tom Waits Maxsim Voice Richard E. Grant Owl Rex Voice Len Cariou The Postmaster Voice Marc Evan Jackson Lars Voice Blythe Danner The Seer Voice Rob Delaney Samuel Voice Ólafur Darri Ólafsson Seamus Voice Chris Butler Screenwriter Samuel Wilson Producer Caleb Deschanel Cinematographer Christopher Murrie-Green Film Editor Dario Marianelli Original Music Nelson Lowry Production Design Solomon Burbridge Art Director Cassie Lopez Art Director Merve Caydere Art Director Deborah Cook Costume Design