The Super Hero Squad Show

The Super Hero Squad Show as a 2009-2011 American animated television series that aired on the Cartoon Network cable channel. It follows the adventures of Marvel Comic superheroes, such as the Avengers and the X-Men, in stories that have a comedic and self-aware tone. It was inspired by the Mini Marvels series of parody comic books.

O, Captain, My Captain! (Season 1, Episode 11)
In a side story, we have the introduction of the Ringmaster. Abomination and Modok pry around the Ringmaster's circus, which prompts Thor and Reptil to go and investigate. After beating the two villains, the Ringmaster appears and hypnotizes the two heroes and puts them to sleep.

Invader from the Dark Dimension (Season 1, Episode 16)
While retrieving a fractal in a statue, Iron Man is pulled into the Dark Dimension where Dr. Strange trapped Baron Mordo. Mordo uses his magic to jump into Iron Man's body and escape the Dark Dimension. In Super Hero City, he calls him Iron Menace and begins to wreak havoc on both the Heroes and the Villains with the tech from Stark Industries. During the fight, he places mind-controlling headbands and Falcon and Redwing, making the first members of his Dark Army. In the next fight, he has Falcon and Redwing place headbands on Wolverine and Abomination increasing his Dark Army. The Squad goes to Dr. Strange and gets him and Valkyrie to help fight Iron Menace and his Dark Army; with the power from the fractal in Dr. Doom's possession, Dr. Strange opens a portal to the Dark Dimension, forces Mordo in and helps Iron Man get his body back. Once Mordo is the Dark Dimension, the headband short out and free everyone from Mordo's control.

Mysterious Mayhem at Mutant High! (Season 1, Episode 19)
Wolverine (Steven Blum) is sent back to Mutant Academy to finish his classes so that he can finally get his diploma. While there, he meets most of the X-Men, as well as The Ringmaster (Carlos Alazraqui), who uses his hypnotic powers to make the X-Men locate a rare Infinity Fractal for Doctor Doom.

Comic #7
RingMaster hypnotize the Super Hero Squad to act in his circus.