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Emile HirschChristopher McCandless / Alexander Supertramp
Marcia Gay HardenBillie McCandless
William HurtWalt McCandless
Jena MaloneCarine McCandless / Additional Narration (voz)
Brian H. DierkerRainey
Catherine KeenerJan Burres
Vince VaughnWayne Westerberg
Kristen StewartTracy Tatro
Hal HolbrookRonald "Ron" Franz
Thure LindhardtMads
Signe Egholm OlsenSonja- Jim GallienJim Gallien
- James J. O'NeillGraduation Reader
- Malinda McCollumWaitress
- Paul KnaulsBuilding Manager
Zach GalifianakisKevin- Craig MutschWayne's Crew #1
- Jim BeidlerWayne's Crew #2
- John DeckerHutterite #1
- John HoferHutterite #2
- Jerry HoferHutterite #3
- Terry WaldnerHutterite #4
- Robin MathewsGail Borah
- Candice CamposBar Girl
Steven WiigLee's Ferry Ranger- Floyd WallMan In Phone Booth
- Bryce WaltersChristopher McCandless (age 4)
- Jim DavisImmigration Officer
Cheryl Francis HarringtonSocial Worker
R. D. CallBull
Haley RammCarine McCandless (age 11)
Merritt WeverLori- Everett 'Insane Wayne' SmithInsane Cain
John JabaleyAnnouncer
Leonard KnightLeonard Knight- Matt ContrerasBook Shopper #1
- Denise SittonBook Shopper #2
- Sharon OldsAdditional Narration (voz)
- Carine McCandlessAdditional Narration (voz)
J. Nathan SimmonsTourist (sem créditos)- Parris MostellerYoung Boy (voz) (sem créditos)
- Timothy LevineAtlanta Braves fan (sem créditos)
Haley SweetBank Teller (sem créditos)- Aaron Wayne HillBig Wheel Boy (sem créditos)
Bart the Bear IIBear