Skipper
Tom McGrath
Kowalski
Jeff Bennett
Mort (voice)
Andy Richter
Rico
John DiMaggio
Private
James Patrick Stewart
Julien
Danny Jacobs
Marlene (voice)
Nicole Sullivan
Maurice
Kevin Michael Richardson
Dr. Blowhole (voice)
Neil Patrick Harris
Savio (voice)
Nestor Carbonell
Clemson (voice)
Larry Miller
Max (voice) / Max
Wayne Knight
Buck Rockgut (voice)
Clancy Brown
Rhonda (voice)
Kathy Kinney
Fred (voice)
Fred Stoller
Lulu (voice)
Jane Leeves
Barry (voice)
Kevin McDonald
Randy (voice)
Will Friedle
Stacy (voice)
Victoria Justice
Becky (voice)
Jennette McCurdy