Bomba the Jungle Boy defends his animal friends from a team of unscrupulous hunters.

In the African jungle, when a hunting expedition organized by ruthless hunter Martin camps for the night, jungle boy Bomba frees four lions trapped by Martin's men. While tracking the freed lions, native guide Jonas discovers Bomba's tracks and shares the information with lion trapper Forbes and his daughter Jean, who are on their way to meet Martin. Soon after, Bomba comes upon Jean in the jungle and explains that he found a wounded lion cruelly left to die. Although Jean tells him the lions are being sent to zoos for educational purposes, Bomba, a friend to all the animals in the jungle, believes that the animals should not be removed from their homes. Jean then promises to tell her father about Bomba's reservations. The next day Forbes and Jean arrive at the encampment and find Martin has already caged over a dozen lions. Martin is furious when he hears the other lions have been freed, but refuses to believe in the Bomba legend. When Forbes suggests they hunt elsewhere to avoid further difficulties, Martin rejects his proposal. Later, Bomba finds Jean alone and leads her to the cubs of the murdered lion. Touched by the vunerable cubs, Jean then bravely confronts her father and Martin about their lion hunting, but they ignore her objections. Bomba, who has been eavesdropping from the trees above, heads for the camp. When Martin spots Bomba freeing the last lion, he shoots at the boy, but Jean pushes Martin's gun, spoiling his aim. When Martin's men refuse to go after Bomba, Jonas suggests that Martin approach the nearby Massai Tribe, who keep lions for protection against other tribes. Martin decides to bribe the Massai into helping him. Frustrated by Martin's greed, Jean tries to convince her father to give up the hunt, but Forbes cannot afford to lose the money he has invested in the expedition. On their way to speak with the Massai, Forbes, Jean and Martin spot Lohu, son of a Massai chief, hunting a lion. When the lion attacks the boy, Martin takes several shots, killing the lion and the boy. In a ruse to secure the Massai lions for himself, Martin takes the boy's body to the chief and claims the lion killed his son. When Martin offers to trap all the lions in the area, the chief naively agrees. After Martin leaves, one of the chief's men reveals that a bullet killed Lohu. When the chief orders his men to kill one of the white people in Martin's group for revenge, Bomba offers to disarm the white men and drive them out of the area in two days. Meanwhile, Jean sees that Martin has set up a fatal trap for Bomba and she races into the jungle to warn him. Charmed by her good intentions, Bomba expresses his affection for Jean. He then calls to birds and monkeys, who tell the lions to leave the area. Within minutes dozens of lions flee the jungle. Fearing the lions might attack Jean, Bomba escorts her back to the encampment, where Martin shoots at him. As Bomba jumps into the river to escape, Martin follows in a boat. When a crocodile attacks Martin, Bomba kills the animal in a fierce knife battle. Despite Bomba having saved his life, Martin vows to continue trapping. Holding Martin at spear point, Bomba cages him in a lion trap and then calls to his animal friends: chimpanzees, baboons, hyenas, leopards, monkeys and birds, to mock Martin. Jean soon finds Martin and laughs at Bomba's joke. Meanwhile, the Massai chief, impatient to avenge his son's death, sends his warriors to drive the lions into Martin's encampment, knowing they will soon be disarmed by Bomba. That night while the hunters sleep, Bomba, unaware of the Massai's plans, takes all of their firearms. Early the next morning, Jean finds Bomba in the jungle, where they both hear the Massai warrior drums driving the lions toward the camp. Bomba then rushes to the encampment to save the men. Martin, Jonas and Forbes lock themselves in a hut for protection, but a lion breaks into the hut, attacks and kills Martin. Before the lion can continue his rampage, Bomba kills the beast with his knife, thus saving Forbes and Jonas. When the Massai warriors arrive at the village, Bomba sends them back to their chief and promises that the white man will be gone in two days. Soon after, as agreed, Forbes, Jonas and Jean leave by boat to return home. Bomba, having preserved the jungle life, waves goodbye.