Bruce Willis
RJ (voice)
Garry Shandling
Verne (voice)
Steve Carell
Hammy (voice)
Wanda Sykes
Stella (voice)
William Shatner
Ozzie (voice)
Nick Nolte
Vincent (voice)
Thomas Haden Church
Dwayne (voice)
Allison Janney
Gladys (voice)
Eugene Levy
Lou (voice)
Catherine O'Hara
Penny (voice)
Avril Lavigne
Heather (voice)
Omid Djalili
Tiger (voice)
Sami Kirkpatrick
Bucky (voice)
Shane Baumel
Spike (voice)
Madison Davenport
Quillo (voice)
Ariel Winter
(voice)
Michaela Jill Murphy
(voice)
Paul Butcher
Skeeter (voice)
Zoe Randol
Mackenzie (voice)
Jessica DiCicco
Shelby (voice)
Debra Wilson
Debbie (voice)
Sean Bishop
Police Officer (voice)
Jeannie Elias
Janis (voice)
Kejon Kesse
Timmy (voice)
Sean Yazbeck
BBQ Barry (voice)
Geoffrey Pomeroy
Ranger (voice)
Joel McCrary
Dr. Dennis (voice)
Lee Bienstock
Lunch Table Larry (voice)
Brian Stepanek
Nugent the Dog (voice)
Steve Alterman
(voice)
Erin Lander
(voice)
Kirk Baily
(voice)
Jordan Orr
(voice)
Michelle Ruff
(voice)
Nicholas Guest
(voice)
Greyson Spann
(voice)
David Hiller
(voice)
April Lawrence
Navistar GPS System (voice)
Bridget Hoffman
(voice)
Marcelo Tubert
(voice)
Sandy Holt
(voice)
Talula Holt
(voice)
Pat Fry
TV Announcer (voice) (uncredited)