Trapped in a cave, five men cut the arm off of another companion in order to ward off starvation. After they are saved, their victim seeks revenge on them one by one.

Benji is a stray who has nonetheless worked his way into the hearts of a number of the townspeople, who give him food and attention whenever he stops by. His particular favorites are a pair of children who feed and play with him against the wishes of their parents. When the children are kidnapped, however, the parents and the police are at a loss to find them. Only Benji can track them down, but will he be in time? If he can save the day, he may just find the permanent home he's been longing for.

在第四部非常成功的弗兰基和安妮特海滩派对电影中，由埃里克·冯·齐珀领导的摩托车团伙绑架了子弹公司管理的歌星Sugar Kane，子弹公司雇佣了Big Drop的跳伞冲浪运动员Steve和Bonnie作为宣传噱头。和一群平常的孩子还有一条名叫洛蕾莱的美人鱼。