The weirdest alien of the galaxy pays a visit to Earth... Jerry Lewis is Kreton, a childish alien who, against his teacher's will leaves his planet to visit the Earth, and lands in the backyard of a famous television journalist who doesn't believe in UFOs and aliens. Wanting to study humans but not able to fully understand them, Kreton makes a mess out of it, generating a lot of comic situations.

Tulsa 是一个在西德驻扎的美国大兵，他喜欢唱歌，还计划在退役后跟几个战友在俄克拉荷马州开一家俱乐部。为了攒够创业本金，他打赌朋友Dynamite可以搞定欧罗巴俱乐部的冷面舞女Lili，跟她单独共度春宵，却不成想Dynamite因为作风问题被提前调回了阿拉斯加。为了不让赌注打水漂，战友们推选女人缘极佳的Tulsa顶替上场。在相处的过程中，Tulsa渐渐爱上了Lili，而他的才华和诚恳也打动了Lili。可因为赌局的缘故，Tulsa深感愧疚，拒绝了Lili的邀约。就在他们本来应该幽会的当晚，Tulsa接到了一个紧急的保姆任务，从来没照顾过小孩的Tulsa被哭闹的宝宝搞得焦头烂额，只好向Lili伸出援手，Lili会施以援手吗？Tulsa该怎么解释赌局呢？