在这部巨猩乔扬剧情/奇幻/冒险片中,芝露自从跟随动物学家的母亲，在非洲森林居住，研究如何保护大猩猩。一次意外，芝露母亲误被猎人所杀，剩下芝露与小猩猩祖相依为命。芝露长大后继承母亲保护大猩猩的志愿，而同时长大的祖亦变得巨大有力，令人望而生畏。二人本来和平相处；一日，猎人见到祖身型庞大，有意捉牠研究，同行者更想将牠卖到城里去。芝露为了避免猎人伤害祖，决定将祖交予城中的动物保护协会。当祖踏进城市，混身不自在，及后遇上当年杀死祖至亲的猎人，祖更是发狂。祖奋力发抗，芝露知道祖的心意，决定协助祖一起返回森林，重过生活。
In Africa, the girl Jill Young trades a baby gorilla with two natives and raises the animal. Twelve years later, the talkative and persuasive promoter Max O'Hara organizes a safari to Africa with the Oklahoma cowboy Gregg to bring attractions to his new night-club in Hollywood. They capture several lions and out of blue, they see a huge gorilla nearby their camping and they try to capture the animal. However, the teenager Jill Young stops the men that intended to kill her gorilla. Max seduces Jill with a fancy life in Hollywood and she signs a contract with him where the gorilla Joseph "Joe" Young would be the lead attraction. Soon she realizes that her dream is a nightmare to Joe and she asks Max to return to Africa. However he persuades her to stay a little longer in the show business. But when three alcoholic costumers give booze to Joe, the gorilla destroys the spot and is sentenced by the justice to be sacrificed. Will Jill, Gregg and Max succeed in saving Joe?
