Boxer Tommy Nelson is accused of killing his manager. While detectives Bud and Lou investigate they come across an invisibility formula with which Tommy injects himself rather than face the police. This sparks an idea for trapping gangster Morgan by having Lou fight champ Rocky Hanlon, with Tommy's invisible help. 查理士拉蒙导演，高脚七、矮冬瓜和亚瑟弗朗兹合演。剧情描述一名拳击手被诬陷为杀人犯，于是把自己变成隐形人，并请两傻扮演的私家侦探为他洗清罪嫌。本片是两傻片集中成绩较好的一部，隐身特技场面处理不俗。
