The Circus Freak Trio are minor, recurring villains that appear in the Ben 10 series. They made their first appearance in Last Laugh.
In Last Laugh, the Circus Freak Trio worked together in the guise of being freak show performers in Zombozo's circus. As his minions, they would perform to lure in an audience for Zombozo. While Zombozo would feed on the crowd's laughter in his show, they would go out and strip the town of all its valuables. After Zombozo was beaten by Ben, the Circus Freak Trio set out on their own.
In Ghostfreaked Out, the Circus Freak Trio appeared trying to steal some trophies, but were ruthlessly thwarted by Zs'Skayr. While they were hiding, Zs'Skayr found them and forcibly became their leader, possessing the three of them to protect himself from a Sun Gun. A little after Zs'Skayr was fried, the Circus Freak Trio were taken to jail.
In Something Zombozo This Way Comes, the Circus Freak Trio have been rehired by Zombozo to distract Ben while he is feeding off everyone's fear. In the end Acid Breath helps Zombozo escape through a cannon and the Circus Freaks are taken to prison.