Quand un jeune garçon est kidnappé par des chasseurs qui croient qu'il connaît l'emplacement d'un grand trésor, Bomba la Jungle Boy cherche à le sauver d'eux et d'un volcan qui est sur le point d'entrer en éruption.

Little David Gordon lives in the jungle with his parents Ruth and Fred, along with their servant Nona. David likes living there while his father captures wild animals; he's made friends with Bomba the jungle boy, who has shown him a great deal about life in the jungle. One day two adventurers come looking for ancient treasure in the shadow of a live volcano.