Steve Coogan
Campbell Babbitt
Olivia Thirlby
Tess Sullivan
Molly Shannon
Penelope Little
Brett Kelly
Blastoff! Chorus
Molly Price
Donna Arbetter
Sarah Lind
Peggy Popoladopolous
Laura Carswell
Lute Lement
Andrew Wheeler
Principal Person
Gabrielle Rose
Mrs. Bridigan
Alexia Fast
Hannah (uncredited)
Kendra Waldman
Dusty Drake
Barry Greene
Sam Calalluci
Levi Sochet
Sam Calalluci (voice)
Barbara Greenbaum
Librarian
Brenna O'Brien
Diminutive Girl
Aiden Lane Robson
Gustave Person
David Allan Pearson
Grease Monkey
Ashley Whillans
Blastoff! Chorus
Calum Worthy
Blastoff! Chorus
Advah Soudack
Blastoff! Chorus
Robin Eder-Warren
Blastoff! Chorus