- Bruce Banner as Tuff
- The Hulk as King Dedede
- Betty Ross as Tiff
- Emil Blonsky as Kirby
- Samuel Sterns as Escargoon
- Dr. Leonard Samson as Iroo
- General "Thunderbolt" Ross as Spikehad
- Tony Stark as Sir Ebrum (uncredited cameo at the end of the film)
- and more
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