While at the Flintstone house, Barney answers the phone, winning a trip to the Captain Caveman Show. Fred becomes jealous because he was the one who told Barney to pick up the phone. Fred tries to prove himself as a hero to the town so he can get the prize instead of Barney, since he would have gotten the prize in the first place.
While babysitting Dusty Rubble, Fred and Barney (with the help of Wilma and Betty) finally get him to sleep. Mr. and Mrs. Rubble think they did a great job and make Fred and Barney take him to the carnival. While there, Dusty starts being a pain to Fred and Barney and disappears on them, and it's up to Fred and Barney to find him before the Rubbles come to pick him up.
Rocky Ratrock challenges the Junior Water Buffalos to a karate match. At first they all think their going to lose until Ms.Rockbottom assigns foreign exchange students -- and Freddy gets a Japanese one. As he sees it, Japanese people know a lot about karate, but his exchange student is a girl named Tamoco. She trains Freddy for the fight, but Freddy plans to let her fight Rocky instead.
Captain Caveman loses his memory while pursuing the Teddy Bear Snatcher. Since he's disguised as a bad guy when he reaches him, Captain Caveman thinks he is a supervillain named Captain Badman, and starts committing crimes. When Captain Badman leaves the true villains with no crimes to commit, they turn to Cavey Jr. for help.
With help from fellow inmates Piggy McGrabit, Trash Man, Teddy Bear Snatchter, and Yuckster, Mr. Bad escapes from prison. He transforms Captain Caveman into a dog with poisoned hot dogs. Cavey Jr. hunts down Mr. Bad for the antidote and to get him back to prison before the poison causes Captain Caveman to permanently remain a dog.
The Flintstone Kids learn the value of saying no to drugs as they set out to win tickets to the upcoming Michael Jackstone concert. Wilma is tempted to drift away from her usual playmates Freddy, Barney and Betty and join up with a gang of older kids who use drugs. Wilma resists the peer-pressure tactics of pre-teen pothead Stoney and instead seeks advice from her parents, who tell her that a real friend wouldn't offer her drugs. To the tune of La Toya Jackson's original composition, "Just Say No," Wilma, Freddy and the others establish their own "Just Say No" club.