’ anticipated return with season 4, Netflix released the first eight minutes of the upcoming premiere -- taking audiences back in time to Eleven’s (Millie Bobby Brown) days in the Hawkins Laboratory. But it’s a glimpse at the past that viewers may not be expecting. In the opening scene, Matthew Modine returns as Martin Brenner, the lead scientist in charge of the laboratory where they’re conducting experiments and research on Eleven as well as the many children that came before her. During a routine session with Ten, things quickly go wrong when he telepathically sees a bloody massacre.