Invaders from outer space make ten robots that look like Fred. These ten look-alikes begin to wreak havoc on Fred, his family, friends, and even his job.

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.