Gazoo resembles a tiny green man and wears a large helmet with antennae. Fred Flintstone and Barney Rubble, whom Gazoo calls "dum-dums", treat him as if he were a genie. Fred and Barney are unable to convince anyone else that Gazoo exists because, as Gazoo often says, "Only children and dum-dums can see me." Gazoo is the only character in the series to not be perpetually barefoot.
Gazoo appears in the Jellystone! episode "Gotta Kiss Them All" as a video game avatar who tricks Augie into destroying the town. In this version, Gazoo is German instead of British.
- It is believed that Gazoo was added to the lineup of characters in the last season because ratings were in decline by that point, and the producers likely felt that adding a new major character was designed to reboost ratings and extend the series' life, but to no avail, as despite best efforts, the show was cancelled in 1966. Despite his absence from future Flintstones cartoons, he was still prominent in merchandise, comic books, and video games, and had his own cereal for a while.