The Hatrocks become depressed after they think the last of the Flintstones, whom they have been in a feud with for the last several hundred years, has died. They soon discover that one Flintstone family – Fred's – is still living. They send a fake will to get the Flintstones to come up and visit. When up at the Flintstone family cabin, the Hatrocks begin to feud with them to no end.

On a fishing trip, Fred finds what he thinks is a kitten. He takes the kitten home as a pet- which soon grows into a lion – and Fred must try to find a way to get rid of the lion, before it eats them out of house and home.

Fred causes a flood at work and is laid off for a week. He decides to take his family and The Rubbles on a camping trip, where a bunch of cave scouts from all around the world are holding a jamboree.