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.约翰尼·卡萨(米奇·鲁尼饰)从一个任性男孩的家里跑了出来，他已经厌倦了被人嘲笑自己个子矮小和运动能力差。很快他就找到了一双旱冰鞋，布鲁诺·克里斯托(Bruno Crystal，拉尔夫·杜姆克[Ralph Dumke]饰)和他成为了朋友，布鲁诺允许他在咖啡馆里洗碗，而家里的牧师奥哈拉神父(帕特·奥布莱恩[Pat O'Brien]饰)则暗中监视着他。

约翰尼表现出一些天赋后，一个正在旅行的轮滑队对他产生了兴趣。他与骄傲的冠军麦克·米勒(格伦·科贝特饰)发生冲突，爱上了另一位顶级滑冰选手玛丽·里夫斯(贝弗利·泰勒饰)。强尼最终在对米勒的比赛中表现得很好，他们轮流超过对方。

随着他的名气越来越大，约翰尼变得和米勒一样傲慢，甚至更多。当他被诊断出患有小儿麻痹症时，他的生活变得很糟糕。随后，他接受了长时间的物理治疗，直到一个坐在轮椅上的强尼试图让自己的生活重回正轨。

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