In the opening moments of Stranger Things 2, it becomes immediately clear that Eleven née Jane isn't the only superpowered woman with a penchant for nosebleeds in the right-side-up universe. The cold open introduces "008," who we'll later learn is Kali, another escapee from the Hawkins lab. But whereas Eleven found world-saving purpose and a makeshift family, Kali is a rogue on a mission to violently kill all the people that tortured her.
For 24-year-old actress Linnea Berthelsen, a major Star Wars fan, there was an easy pop culture analogy to be made: If Eleven is the Luke Skywalker of Stranger Things, she's the Anakin.
After that initial appearance, Berthelsen's 008 goes away until the seventh episode, when Eleven heads out to look for her "lost sister" after peering into her birth mother's addled mind. Kali, whose gift involves the ability to alter perception, attempts to draw Eleven into her revenge plot, and teaches her to harness her rage to grow her power. The installment, a departure from the main plot, has proved divisive among viewers, so much so that creators Matt and Ross Duffer have defended their choice to do it in an interview with Entertainment Weekly. "There is a reason for this episode to happen and I think they deserve our trust," Berthelsen told Thrillist. "They know what they are doing."