Character Name : Christopher McCandless / Alexander Supertramp

Original Name : Emile Hirsch

Gender : Male

Character Name : Billie McCandless

Original Name : Marcia Gay Harden

Gender : Female

Character Name : Walt McCandless

Original Name : William Hurt

Gender : Male

Character Name : Carine McCandless / Additional Narration (voice)

Original Name : Jena Malone

Gender : Female

Character Name : Rainey

Original Name : Brian H. Dierker

Gender : Male

Character Name : Jan Burres

Original Name : Catherine Keener

Gender : Female

Character Name : Wayne Westerberg

Original Name : Vince Vaughn

Gender : Male

Character Name : Tracy Tatro

Original Name : Kristen Stewart

Gender : Female

Character Name : Ronald "Ron" Franz

Original Name : Hal Holbrook

Gender : Male

Character Name : Mads

Original Name : Thure Lindhardt

Gender : Male

Character Name : Sonja

Original Name : Signe Egholm Olsen

Gender : Female

Character Name : Jim Gallien

Original Name : Jim Gallien

Gender : Male

Character Name : Graduation Reader

Original Name : James J. O'Neill

Gender : Male

Character Name : Waitress

Original Name : Malinda McCollum

Gender : Male

Character Name : Building Manager

Original Name : Paul Knauls

Gender : Male

Character Name : Kevin

Original Name : Zach Galifianakis

Gender : Male

Character Name : Wayne's Crew #1

Original Name : Craig Mutsch

Gender : Male

Character Name : Wayne's Crew #2

Original Name : Jim Beidler

Gender : Male

Character Name : Hutterite #1

Original Name : John Decker

Gender : Male

Character Name : Hutterite #2

Original Name : John Hofer

Gender : Male

Character Name : Hutterite #3

Original Name : Jerry Hofer

Gender : Male

Character Name : Hutterite #4

Original Name : Terry Waldner

Gender : Male

Character Name : Gail Borah

Original Name : Robin Mathews

Gender : Female

Character Name : Bar Girl

Original Name : Candice Campos

Gender : Male

Character Name : Lee's Ferry Ranger

Original Name : Steven Wiig

Gender : Male

Character Name : Man In Phone Booth

Original Name : Floyd Wall

Gender : Male

Character Name : Christopher McCandless (age 4)

Original Name : Bryce Walters

Gender : Male

Character Name : Immigration Officer

Original Name : Jim Davis

Gender : Male

Character Name : Social Worker

Original Name : Cheryl Francis Harrington

Gender : Female

Character Name : Bull

Original Name : R. D. Call

Gender : Male

Character Name : Carine McCandless (age 11)

Original Name : Haley Ramm

Gender : Female

Character Name : Lori

Original Name : Merritt Wever

Gender : Female

Character Name : Insane Cain

Original Name : Everett 'Insane Wayne' Smith

Gender : Male

Character Name : Announcer

Original Name : John Jabaley

Gender : Male

Character Name : Leonard Knight

Original Name : Leonard Knight

Gender : Male

Character Name : Book Shopper #1

Original Name : Matt Contreras

Gender : Male

Character Name : Book Shopper #2

Original Name : Denise Sitton

Gender : Male

Character Name : Additional Narration (voice)

Original Name : Sharon Olds

Gender : Male

Character Name : Additional Narration (voice)

Original Name : Carine McCandless

Gender : Male

Character Name : Tourist (uncredited)

Original Name : J. Nathan Simmons

Gender : Male

Character Name : Young Boy (voice) (uncredited)

Original Name : Parris Mosteller

Gender : Male

Character Name : Atlanta Braves fan (uncredited)

Original Name : Timothy Levine

Gender : Male

Character Name : Bank Teller (uncredited)

Original Name : Haley Sweet

Gender : Female

Character Name : Big Wheel Boy (uncredited)

Original Name : Aaron Wayne Hill

Gender : Male

Character Name : Bear

Original Name : Bart the Bear II

Gender : Male