Mesmero

Mesmero is a mutant that can control minds. He serves Apocalypse.

X-Men Evolution: Dark Horizons
To open the third and final gate, Mesmero enlisted the help of Mystique, over whom his powers had no control. He controlled her foster daughter, Rogue, and forced her to absorb the powers of all of her fellow X-Men, as well as members of the Brotherhood of Mutants and the Acolytes. Mesmero deceived Mystique into opening the third gate, then forced Rogue to awaken Apocalypse by "feeding" him the powers she had stolen earlier.

X-Men Evolution: Ascension
However, once Apocalypse was reawakened, he lost interest in his former loyal servant, and the X-Men found Mesmero some time later, back in his tent at the carnival. Charles Xavier was able to learn Apocalypse's plan by scanning Mesmero's mind.

Appearances/Voice Actors

 * TV Movies (2 films)
 * X-Men Evolution: Dark Horizons - Ron Halder
 * X-Men Evolution: Ascension - Ron Halder

Trivia

 * Mesmero is given Mr. Sinister's role in this universe as Apocalypse's aid.