Wizards of Waverly Place (2007)

S2E8 Harper Knows

In an effort to keep her magical identity hidden, Alex attempts to steer clear of Harper during the yearly Comic-Con-like event. However, her plans unravel when Harper dons Alex's enchanted Battle Diva outfit and inadvertently exposes the truth. Meanwhile, Justin and Max team up with Hugh Normous and the Emergency Wizards to prevent other wizards from using genuine magic at the convention, ensuring that the event remains safe and entertaining for all attendees.