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Jimmy"TheLightningBolt"Leeisaformermixedmartialartschampionwhoreturnshomeandisaskedbyhisfatherfigure,Charlie,toteachagroupofinnercitykidsmartialartsinpreparationforatournament.Thereigningjuniornationalchampions,theBeverlyHillsScorpions,arecoachedbytheverycockyandarrogantTedBarret,whoisaformerrivalofJimmy's.WithhelpfromlocalfoodtruckvendorBigMama,Jimmy'steambecomestheUnderdogs.AstheUnderdogsprepareforthebigtournament,boththekidsandJimmylearnsomelessonsfromeachotherthatwillmaketheirbondstrongerastheyprepareforashowdownwiththeScorpions.
