Viidakon salaisuus was released in the year 1956。Viidakon salaisuus is also called as Curucu, Beast of the Amazon, Monstret från Amazonas, Kurussù la bestia delle amazzoni, o Terror do Amazonas, die Bestie vom Amazonas, o Terror das Amazonas, Curuçu。

Rock Dean and Dr. Andrea Romar travel up the Amazon River to find out why the plantation workers have left their work in panic, allegedly because of attacks from Curucu, a monster who is said to live up the river where no white man has ever been before...