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