The Great Gazoo is a character who appeared in the final season of The Flintstones. Voiced by Harvey Korman, 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.
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.