- Thure Lindhardt - Mads
- Signe Egholm Olsen - Sonja
- Zach Galifianakis - Kevin
- Steven Wiig - Lee's Ferry Ranger
- Bryce Walters - Christopher McCandless (age 4)
- Cheryl Francis Harrington - Social Worker
- R. D. Call - Bull
- Haley Ramm - Carine McCandless (age 11)
- Merritt Wever - Lori
- John Jabaley - Announcer
- Leonard Knight - Leonard Knight
- J. Nathan Simmons - Tourist (uncredited)
- Parris Mosteller - Young Boy (voice) (uncredited)
- Aaron Wayne Hill - Big Wheel Boy (uncredited)
- Bart the Bear II - Bear
- Lyn Matsuda Norton
-
Sean Penn
- Francine Maisler
- Sean Penn
- Lauren Grey
- Martín Hernández
- Christopher Barnett
- Nerses Gezalyan
- Michael Minkler
- Lora Hirschberg
- Eddie Vedder
Capítulo disponible en las siguientes plataformas: