Allison Janney

Bren MacGuff

Jason Bateman

Mark Loring

J.K. Simmons

Mac MacGuff

Cut Chemist

Chemistry Teacher

Jason Reitman

Director

Rainn Wilson

Rollo

Michael Cera

Paulie Bleeker

Eileen Pedde

Gerta Rauss

Emily Tennant

Pretty-to-Goth Girl

Joseph Drake

Executive Producer

Nathan Kahane

Executive Producer

Elliot Page

Juno MacGuff

Daniel Dubiecki

Executive Producer

Jennifer Garner

Vanessa Loring

Emily Perkins

Punk Receptionist

Candice King

Amanda, Girl Lab Partner

Kirsten Alter

Nurse

Olivia Thirlby

Leah

Daniel Clark

Steve Rendazo

Darla Fay

Bleeker's Mom

Aman Johal

Vijay

Valerie Tian

Su-Chin

Kaaren de Zilva

Ultrasound Technician

Steven Christopher Parker

Guy Lab Partner

Sierra Pitkin

Liberty Bell

Eve Harlow

Tough Girl

Ashley Whillans

Katrina De Voort

Jeff Witzke

Track Announcer

Diablo Cody

Writer