But Agatha has lost none of her deceptive ways. In “WandaVision,” “she enjoyed this long game of cat and mouse,” Hahn says. “You never really knew, deliberately, what she wanted from Wanda. Was it, besides power, friendship? Was it a lover?” Her “shape-shifting” continues in the new show, though it’s more subtle. “She gets to perform and gather a coven of depressing witches,” the actress adds with a laugh. “She tries to trick them every time she tries to gain sympathy. She’s the same Agatha. She just uses those tactics in different ways.”

The fact that Agatha was earning her own spinoff was delightful news for Hahn: “I just thought I’d get on this ride and say, ‘See you later,'” she says of her “WandaVision” performance. But her mesmerizing take on a mid-level Marvel Comics character was a hit with fans and Marvel executives alike. Getting the call about the show was “like a fever dream,” she says, recalling how she burst into tears when one of the “WandaVision” production assistants wished her well on the first day of filming for “Agatha.”