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.

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.