Humphrey (voice)
Justin Long
Kate (voice)
Hayden Panettiere
Lilly (voice)
Christina Ricci
Sweets (voice)
Elizabeth Tulloch
Reba (voice)
Christine Lakin
Debbie (voice)
Mindy Sterling
Garn (voice)
Fred Tatasciore
Porcupine (voice)
Nika Futterman
Candy (voice)
Mela Lee
Park Ranger (voice)
Steve Vinovich
Thug (voice) (uncredited)
Aziz Ansari
Can-do (voice)
Eric Lopez
Tony (voice)
Dennis Hopper
Claws / Janice (voice)
Marilyn Tokuda
Bear Cub (voice) (as Maya Feltheimer)
Maya Kay
Winston (voice)
Danny Glover
Marcel (voice)
Larry Miller
Paddy / Mooch (voice)
Eric Price
Eve (voice)
Vicki Lewis
Garth (voice)
Chris Carmack
Shakey (voice)
Kevin Sussman
Salty (voice)
Brian Donovan
Original Music Composer
Chris Bacon
Director
Ben Gluck
Story
Producer
Richard Rich
Screenplay
Chris Denk
Anthony Bell
Editor
Joe Campana
Scott Anderson
Steve Moore
Ken Katsumoto
Executive Producer
Michael Paseornek
A.K. Madhavan
Noah Fogelson
Color Timer
Terry Claborn
Music Supervisor
Jay Faires
Art Direction
Donald Towns
Tracy McKnight