Mystery about an ex-prizefighter who embarks on a journey to find 13 missing diamonds

Corey (Fred Savage) refuses to let his emotionally disturbed younger brother Jimmy (Luke Edwards) be institutionalized, and the two run away together. They soon join forces with a resourceful girl (Jenny Lewis), who notices that Jimmy has a special talent: he is a “wizard” at video games and can achieve the high score on absolutely everything he plays. Evading their parents and a sinister bounty hunter, the trio head for a climactic showdown at the national video game championships in California.