Bobby, Benji, and Huey are back and Benji is smitten with Bobby's little sister, who has blossomed into a beautiful young woman. The two start dating in secret, but are soon discovered by Bobby, who wrongly assumes that Benji has taken advantage of his sister. A sad series of events proves Bobby wrong and he reaches Benji just in time as he sits at the top of a cliff. More sexual misadventures set against an amazing 50's soundtrack.