Steve Coogan

Campbell Babbitt

Hilary Duff

Lucy Diamond

Olivia Thirlby

Tess Sullivan

Josh Peck

Jim Lement

Molly Shannon

Penelope Little

Brett Kelly

Blastoff! Chorus

Molly Price

Donna Arbetter

Max Hoffman

Fenster Itski

Sarah Lind

Peggy Popoladopolous

Laura Carswell

Lute Lement

Ingrid Nilson

Ann

Andrea Brooks

Sue

Andrew Wheeler

Principal Person

Gabrielle Rose

Mrs. Bridigan

Colleen Rennison

Sylvia

Aubrey Mozino

Blyth

Alexia Fast

Hannah (uncredited)

Kendra Waldman

Dusty Drake

Aaron Brooks

Ezra

Barry Greene

Sam Calalluci

Levi Sochet

Sam Calalluci (voice)

Katie Messina

Gina

Alana Husband

Angela

Barbara Greenbaum

Librarian

Brenna O'Brien

Diminutive Girl

Aiden Lane Robson

Gustave Person

David Allan Pearson

Grease Monkey

Jilena Cori

Mrs. Person

Patricia Drake

Mrs. Itski

Ashley Whillans

Blastoff! Chorus

Calum Worthy

Blastoff! Chorus

Advah Soudack

Blastoff! Chorus

Robin Eder-Warren

Blastoff! Chorus