Jimmy "The Lightning Bolt" Lee is a former mixed martial arts champion who returns home and is asked by his father figure, Charlie, to teach a group of inner city kids martial arts in preparation for a tournament. The reigning junior national c{Ziyuantun.Com}hampions, the Beverly Hills Scorpions, are coached by the very cocky and arrogant Ted Barret, who is a former rival of Jimmy's. With help from local food truck vendor Big Mama, Jimmy's team becomes the Underdogs. As the Underdogs prepare for the big tournament, both the kids and Jimmy learn some lessons from each other that will make their bond stronger as they prepare for a showdown with the Scorpions. 译文(2): “闪电”吉米 · 李是前综合格斗冠军，回到家后，他的父亲查理要求他教一群市中心的孩子武术，为一场锦标赛做准{资源屯-ziyuantun.com}。卫冕少年国家冠军，比华利山别墅蝎子队的教练是非常自大和傲慢的泰德巴雷特，他是吉米的前竞争对手。在当地快餐车供应商“大妈妈”的帮助下，吉米的队伍成为了“失败者”。在“失败者”们为大赛做准备的时候，孩子们和吉米都从对方身上学到了一些东西，这些东西会让他们在准备与“蝎子”对决的时候更加紧密地联系在一起。
