El Mysterioso is magician who appeared in El Queso Mysterioso, where he was performing in the Magicians' Convention. He uses special effects during his performance, and supposedly makes Becky and Bob "disappear" after he chooses them to be part of his act. The audience thought they had actually disappeared, but in reality Becky had used it as an opportunity to fly off to fight Dr. Two-Brains. El Mysterioso is distraught by the incident, and admits to the audience that doesn't really have any special abilities, and that his real name is Mitch. When he "accidentally" brings them back, he then starts to believe that he has too much power.