Justin Long

Humphrey (voice)

Hayden Panettiere

Kate (voice)

Dennis Hopper

Tony (voice)

Danny Glover

Winston (voice)

Larry Miller

Marcel (voice)

Eric Price

Paddy / Mooch (voice)

Vicki Lewis

Eve (voice)

Chris Carmack

Garth (voice)

Kevin Sussman

Shakey (voice)

Brian Donovan

Salty (voice)

Christina Ricci

Lilly (voice)

Elizabeth Tulloch

Sweets (voice)

Christine Lakin

Reba (voice)

Mindy Sterling

Debbie (voice)

Fred Tatasciore

Garn (voice)

Nika Futterman

Porcupine (voice)

Mela Lee

Candy (voice)

Steve Vinovich

Park Ranger (voice)

Aziz Ansari

Thug (voice) (uncredited)

Eric Lopez

Can-do (voice)

Marilyn Tokuda

Claws / Janice (voice)

Maya Kay

Bear Cub (voice) (as Maya Feltheimer)