Monstres sur notre planète was released in the year 1958。Monstres sur notre planète is also called as I Married a Monster from Outer Space, Me casé con un monstruo del espacio exterior, Jag är gift med en utomjording, J'ai épousé un monstre, Ho sposato un mostro venuto dallo spazio, Flickan och monstret。

Aliens from Outer Space are slowly switching places with real humans -- one of the first being a young man about to get married. Slowly, his new wife realizes something is wrong, and her suspicions are confirmed when her husband's odd behaviour begins to show up in other townspeople.