一个平庸的小市民“低B”，是一个十分普通的新闻记者，最近被同事好友陷害，炒股票，还欠下一身高利贷。某夜，他目睹绑匪二人互相残杀，发现了两百万美元的赌金。并偷了三四十万美金。更结交了一班损友。因妻子寂寞的绿故，而和酒醉大春在家中发生关系，不料低B带了二个美女回家过夜，最后，互相发现而起了争执，大春举起铁锤打向低B，另一方面警探阿超锲而不舍地追查低B，直至在逃的另一绑匪鬼影出现，低B坚决不承认偷走赎金，而妻子为了救低B，死在绑匪枪下，低B亦难逃被杀的命运……
Johnny Casar (Mickey Rooney) runs away from a home for wayward boys, tired of being teased about being short and a poor athlete. He soon finds a pair of roller skates and is befriended by Bruno Crystal (Ralph Dumke), who allows him to wash dishes at his café, while a priest who runs the home, Father O'Hara (Pat O'Brien), secretly keeps an eye on him. A traveling roller-skating team takes an interest in Johnny after he shows some aptitude. He clashes with Mack Miller (Glen Corbett), a cocky champion, and falls for Mary Reeves (Beverly Tyler), another top skater. Johnny ends up featured in grudge matches against Miller, where they take turns one-upping one another. As his fame grows, Johnny becomes every bit as arrogant as Miller and more. Life takes a bad turn when he is diagnosed with polio. A long period of physical therapy follows, until a wheelchair-bound Johnny tries to get his life back on track.
