- Marty McFly as Dexter
- Goldie Wilson as Tall Dexter
- George McFly as Dexter's Dad
- Biff Tannen as Mandark
- Einstein as Dexter's Monkey
- Lou Caruthers as Major Glory
- Sam Baines as Krunk
- Doc Emmett Brown as Professor Williams
- Tannen's gang as Gary, School bully #1, School bully #2
- Buford Tannen as Red-Eye
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