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.

An eccentric millionaire and his grandchildren are embroiled in the plights of some forest gnomes who are searching for the rest of their tribe. While helping them, the millionaire is suspected of being crazy because he's seeing gnomes! He's committed, and the niece and nephew and the gnomes have to find him and free him.

在圣巴勃罗海滨，一场醉酒狂欢后，鲍勃担心他可能杀害了一名男子，由于不确定，他需要到孤立的船上找一份工作。那天晚上，他救了企图自杀的安娜并把她带上了船。但是鲍勃的伙伴Tiny想驱逐安娜，担心她会破坏兄弟之情，而尚未解决的谋杀悬疑正是Tiny所需要的借口，海面上四伏着浓雾与邪恶...