Anton Yelchin

Character: Charlie Bartlett

Robert Downey Jr.

Character: Nathan Gardner

Hope Davis

Character: Marilyn Bartlett

Kat Dennings

Character: Susan Gardner

Tyler Hilton

Character: Murphy Bivens

Mark Rendall

Character: Kip Crombwell

Dylan Taylor

Character: Len Arbuckle

Megan Park

Character: Whitney Drummond

Jonathan Malen

Character: Jordan Sunder

Stephen Young

Character: Dr. Stan Weathers

Ishan Davé

Character: Henry Freemont

Dave Brown

Character: Officer Hansen

Eric Fink

Character: Thomas

Noam Jenkins

Character: Dean West

Lauren Collins

Character: Kelly

Annick Obonsawin

Character: Daisy

Sarah Gadon

Character: Priscilla

Drake

Character: A/V Jones

Michael D'Ascenzo

Character: Scott

Dwayne McLean

Character: Bus Driver

Quancetia Hamilton

Character: Mrs. Albertson

Richard Alan Campbell

Character: Dr. Sam Costell

Kim Roberts

Character: Dr. Linda Jenkins

David Fraser

Character: Dr. Jacob Kaufmann

Marvin Karon

Character: Dr. P. Sarossy

Abigail Bernardez

Character: Cheerleader #1

Laura Jeanes

Character: Cheerleader #2

Annamaria Janice McAndrew

Character: Cheerleader #3

Amelia Tenttave

Character: Len's Girlfriend #1

Annabelle Singson

Character: Len's Girlfriend #2

Julia Cohen

Character: Receptionist

Abby Zotz

Character: Kip's Mom

Maddy Wilde

Character: Spiral Beach Band Member

Dorian Wolf

Character: Spiral Beach Band Member

Airick Woodhead

Character: Spiral Beach Band Member

Daniel Woodhead

Character: Spiral Beach Band Member

Jake Epstein

Character: Dustin Lauderbach

Brendan Murray

Character: Dorm Head

Derek McGrath

Character: Superintendent Sedgwick