Fred, Wilma, Betty, and Barney take a trip to Rockapulco, where jewel thieves pretend to befriend Fred in order to frame him for stealing more jewels while in Mexico.

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.