Harry Potter™ Harry Potter His Mark Graphic T-Shirt. Unlock magical secrets hiding in the closet under the stairs with these officially licensed Harry Potter styles! Head to Hogwarts with your favorite witches and wizards like Harry, Hagrid, Dumbledore, Hermione Granger, Ron Weasley, and Neville Longbottom and learn to defeat He Who Shall Not Be Named! And, just remember, the spell is Wing-gar-dium Levi-o-sa and NOT Wingardium Leviosa!. His Mark.