Ep 3. Invisible Barney

In this episode of The Flintstones, titled "Invisible Barney," Barney Rubble becomes invisible after he accidentally drinks a potion that Fred had made as a secret experiment. This causes all sorts of chaos for Barney, who tries to go about his day as usual but finds that nobody can see or hear him.

At first, Barney thinks that everyone is just ignoring him for some reason, but as the day goes on he realizes that something strange is going on. He tries to talk to Fred and Wilma, but they can't see him or hear him at all. He even tries to grab onto them, but his hands go right through them.

Meanwhile, Fred is feeling guilty for what he's done and is trying to figure out a way to reverse the effects of the potion. He enlists the help of the Great Gazoo, who tells him that the only way to get Barney back to normal is to find a rare herb that only grows on the other side of a dangerous mountain.

Fred sets out on a mission to find the herb, but he soon realizes that he's in over his head. He gets lost in a cave and has to fend off some wild animals, including a saber-toothed tiger and a giant spider. Eventually, he manages to find the herb and brings it back to Gazoo, who uses his magical powers to create an antidote for Barney.

Back at home, Wilma and Betty are trying to cheer Barney up by pretending that they can talk to him, even though they can't actually see or hear him. They set up an elaborate charade involving a phone and a ventriloquist dummy, but Barney is still feeling hopeless.

Just as he's about to give up entirely, Gazoo arrives with the antidote and tells him to drink it. Barney does as he's told, and moments later he reappears in front of everyone. They're all overjoyed to see him again, and they celebrate his return with a big feast.

In the end, everything goes back to normal and the gang continues on with their lives as usual. But the experience has taught them all the value of friendship and how important it is to be there for one another, even when things get tough.