When Disney+ first launched, it left a significant amount of merchandising money on the table by keeping Baby Yoda tightly under wraps before his big debut in The Mandalorian. That’s definitely not the case for WandaVision. Less than a week after the show revealed that Kathryn Hahn’s Agnes is — spoilers ahead — secretly the mischievous witch Agatha Harkness, the official Marvel website is now loaded with merchandise for Hahn’s catchy, confessional theme song “Agatha All Along.”