Synopsis by Hal Erickson
Hoping to cure Barney's hiccups, Fred administers a dose of the new soft drink that he has invented in his garage. However, the drink has a curious effect on Barney--namely, it renders him invisible! The rest of the episode finds Fred trying to cover up his "lab mistake", with Barney's disembodied voice causing him all manner of trouble. "Invisible Barney" was the series' first episode to be telecast in color, the first to include the "going to the drive-in" opening credits, and the first to feature the familiar theme music "Meet the Flintstones."