“She was just so toxic,” Kimbal says. “A nightmare.” Musk’s chief of staff Sam Teller compares her to a comic-book villain. “She was like the Joker in Batman,” he says. “She didn’t have a goal or aim other than chaos. She thrives on destabilizing everything.” She and Musk would stay up all night fighting, and then he would not be able to get up until the afternoon.