John Travolta

Bolt (voice)

Miley Cyrus

Penny (voice)

Susie Essman

Mittens (voice)

Mark Walton

Rhino (voice)

Malcolm McDowell

Dr. Calico (voice)

James Lipton

The Director (voice)

Greg Germann

The Agent (voice)

Diedrich Bader

Veteran Cat (voice)

Nick Swardson

Blake (voice)

J. P. Manoux

Tom (voice)

Dan Fogelman

Billy (voice)

Kari Wahlgren

Mindy Parker (voice)

Chloë Grace Moretz

Young Penny (voice)

Randy Poffo

Thug (voice)

Ronn Moss

Dr. Forrester (voice)

Grey DeLisle

Penny's Mom (voice)

Sean Donnellan

Penny's TV Dad (voice)

Lino DiSalvo

Vinnie (voice)

Todd Cummings

Joey (voice)

Tim Mertens

Bobby (voice)

Kelly Hoover

Ester (voice)

Brian Stepanek

Martin (voice)

Jeff Bennett

Lloyd (voice)

Daran Norris

Louie (voice)

John DiMaggio

Saul (voice)

Jenny Lewis

Assistant Director (voice)

Anne Lockhart

Additional Voices (voice)

Phil LaMarr

Additional Voices (voice)

June Christopher

Additional Voices (voice)

Christin Ciaccio Briggs

Additional Voices (voice)

David Cowgill

Additional Voices (voice)

Terri Douglas

Additional Voices (voice)

Jackie Gonneau

Additional Voices (voice)

Nathan Greno

Additional Voices (voice)

Forrest Iwaszewski

Additional Voices (voice)

Holly Kaneko

Additional Voices (voice)

Daniel Kaz

Additional Voices (voice)

Dara McGarry

Additional Voices (voice)

Scott Menville

Additional Voices (voice)

Jonathan Nichols-Navarro

Additional Voices (voice)

Paul Pape

Additional Voices (voice)

Lynwood Robinson

Additional Voices (voice)

Karen Ryan

Additional Voices (voice)

Tara Strong

Additional Voices (voice)

Pepper Sweeney

Additional Voices (voice)

Joe Whyte

Additional Voices (voice)

Chris Williams

Additional Voices (voice)

Stephen J. Anderson

Additional Voices (voice)