Teen Titans

Teen Titans is an American animated superhero television series created by Glen Murakami, based on the DC Comics characters of the same name. Teen Titans follows Robin, Starfire, Raven, Beast Boy, and Cyborg as they defend Jump City and the world from an array of super villains.

Mad Mod (Season 1, Episode 10)
In this episode, the Teen Titans find themselves captured by so-British-it-hurts villain Mad Mod, who uses an array of psychedelic designs to hypnotize them. Mostly Beast Boy.

Revolution (Season 3, Episode 7)
It's the Fourth of July and everyone is celebrating, until Mad Mod crashes the party and uses his hypno-screens to hypnotize everyone into serving him as "King Moddy the First" and transforms the city's infrastructure into strange copies of British buildings, claiming that the United States now belong with Britain again. When the Titans go after him, he steals Robin's youth with his cane, turning the leader of the Teen Titans into a gray-haired and weak old man, and the rest of the team has to rescue him while facing down the belligerent Brit's army.

Titans East - Part 2 (Season 3, Episode 12)
To Cyborg's shock, the Titans East reveal that they are under Brother Blood's control. Brother Blood then himself reappears with some shocking changes: he is now half robot, having used Cyborg's technology on himself. Cyborg barely manages to escape, and he calls the others for help.

Mother Mae-Eye (Season 4, Episode 10)
Summoned through an enchanted pie accidentally brought back to the Tower by Cyborg, Mother Mae-Eye manages to induce mind-control over all the Titans, mentally regressing them into obedient, sweet "children" who regard her as their mother. When Starfire is accidentally knocked out of the villain's mind-control during a mission against the H.I.V.E. Five, she realizes the truth behind Mother and attempts to bring her fellow Titans' minds back to teenaged maturity.