Wizards of Waverly Places: Season 2, Episode 8

2 - 8: Harper Knows

Alex tries to avoid running into Harper at the annual Comic-Con type convention in order to protect her wizard secret but winds up revealing the truth after Harper takes a spin in Alex’s power laden Battle Diva costume. Meanwhile, Justin and Max work alongside Hugh Normous and the Emergency Wizards to make sure other wizards don’t perform any real magic.