Monstro was released in the year 1954。Monstro is also called as Creature from the Black Lagoon, Monstret i den svarta lagunen, Monstre des marais, Monster der moerassen, Black Lagoon, Étrange créature du lagon noir, Étrange créature du lac noir。

A scientific expedition searching for fossils along the Amazon River discover a prehistoric Gill-Man in the legendary Black Lagoon. The explorers capture the mysterious creature, but it breaks free. The Gill-Man returns to kidnap the lovely Kay, fiancée of one of the expedition, with whom it has fallen in love.