SPOILER WARNING: This article contains spoilers for Stranger Things Season 2, streaming now on Netflix.
When Stranger Things Season 2 ended, fans were left guessing if the villainous Dr. Martin Brenner is actually alive. He appeared as a hallucination to Eleven thanks to the mental projections of Kali, a fellow test subject labelled Eight, and then in conversation when the duo almost killed Brenner's former employee Ray Carroll, who revealed that he could take them to Brenner. According to the show's executive producer Shawn Levy, Carroll is correct and Brenner is indeed alive and well.
"Whether or not people feel that episode  was entirely successful, the Duffers want to take some swings, and they know that they’re not gonna please everybody. But that feeling of the world getting a bit bigger especially coupled with the fact that it now seems clear that Brenner is alive, Brenner is out there," Levy told Collider.
"I, for one, think that that one scene with Modine and Millie in Episode 7 is one of the juiciest scenes, and it kind of brought me back to how haunting Modine is in that Brenner role," he added. With Season 3 already in the works, Levy indicated that Brenner's return could be explored, as well as the other test subjects like Eleven.
Now streaming on Netflix, Stranger Things Season 2 stars Winona Ryder, David Harbour, Finn Wolfhard, Millie Bobby Brown, Gaten Matarazzo, Caleb McLaughlin, Natalia Dyer, Charlie Heaton, Cara Buono, Matthew Modine, Noah Schnapp, Joe Keery, Sadie Sink and Dacre Montgomery.