cast
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Emile Hirsch
Christopher McCandless / Alexander Supertramp
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Marcia Gay Harden
Billie McCandless
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William Hurt
Walt McCandless
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Jena Malone
Carine McCandless / Additional Narration (voice)
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Brian H. Dierker
Rainey
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Catherine Keener
Jan Burres
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Vince Vaughn
Wayne Westerberg
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Kristen Stewart
Tracy Tatro
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Hal Holbrook
Ronald "Ron" Franz
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Thure Lindhardt
Mads
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Signe Egholm Olsen
Sonja
- Jim Gallien Jim Gallien
- James J. O'Neill Graduation Reader
- Malinda McCollum Waitress
- Paul Knauls Building Manager
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Zach Galifianakis
Kevin
- Craig Mutsch Wayne's Crew #1
- Jim Beidler Wayne's Crew #2
- John Decker Hutterite #1
- John Hofer Hutterite #2
- Jerry Hofer Hutterite #3
- Terry Waldner Hutterite #4
- Robin Mathews Gail Borah
- Candice Campos Bar Girl
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Steven Wiig
Lee's Ferry Ranger
- Floyd Wall Man In Phone Booth
- Bryce Walters Christopher McCandless (age 4)
- Jim Davis Immigration Officer
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Cheryl Francis Harrington
Social Worker
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R. D. Call
Bull
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Haley Ramm
Carine McCandless (age 11)
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Merritt Wever
Lori
- Everett 'Insane Wayne' Smith Insane Cain
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John Jabaley
Announcer
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Leonard Knight
Leonard Knight
- Matt Contreras Book Shopper #1
- Denise Sitton Book Shopper #2
- Sharon Olds Additional Narration (voice)
- Carine McCandless Additional Narration (voice)
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J. Nathan Simmons
Tourist (uncredited)
- Parris Mosteller Young Boy (voice) (uncredited)
- Timothy Levine Atlanta Braves fan (uncredited)
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Haley Sweet
Bank Teller (uncredited)
- Aaron Wayne Hill Big Wheel Boy (uncredited)
- Bart the Bear 2 Bear