- Bruce Banner as Garfield
- The Hulk as Jon Arbuckle
- Betty Ross as Penelope Pussycat
- Emil Blonsky as Doc Boy
- Samuel Sterns as Nermal
- Dr. Leonard Samson as Aloysius Pig
- General "Thunderbolt" Ross as Bo Sheep
- Tony Stark as Odie (uncredited cameo at the end of the film)
- and more
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