Space Ace

Don Bluth's Space Ace continues the adventures of the musclebound hero Ace, where the villainous Commander Borf attacks Ace with the "Infanto Ray", a weapon that transforms him into an adolescent version of himself, and kidnaps his girlfriend Kimberly. It is up to Dexter - Ace's younger incarnation - to rescue Kimberly and prevent Borf using the Infanto Ray to conquer Earth!