<Ul> <Li> Winona Ryder as Joyce Byers, the mother of Will and Jonathan Byers . She is divorced from Lonnie Byers . </Li> <Li> David Harbour as Jim Hopper, chief of Hawkins Police Department . After his young daughter died of cancer, Hopper got divorced and lapsed into alcoholism . </Li> <Li> Finn Wolfhard as Mike Wheeler, son of Karen and Ted, younger brother of Nancy, and one of three friends of Will Byers . He is an intelligent and conscientious student and is committed to his friends . He falls in love with Eleven . </Li> <Li> Millie Bobby Brown as Eleven ("El"), a young girl with psychokinetic abilities and a limited vocabulary . Her real name is Jane, the biological daughter of Terry Ives . After escaping from Hawkins Laboratory, where experiments were being performed on her, she befriends Mike, Dustin, and Lucas . She falls in love with Mike . </Li> <Li> Gaten Matarazzo as Dustin Henderson, one of Will's friends . His cleidocranial dysplasia causes him to lisp . In the second season, he is proud of his new front teeth and is attracted to Max . </Li> <Li> Caleb McLaughlin as Lucas Sinclair, one of Will's friends . He is wary of Eleven but later befriends her . In season two, he is one of Max's love interests . </Li> <Li> Natalia Dyer as Nancy Wheeler, daughter of Karen and Ted and older sister of Mike . In season one, she is Steve Harrington's girlfriend . In season two, she becomes Jonathan Byers' girlfriend . </Li> <Li> Charlie Heaton as Jonathan Byers, the older brother of Will Byers and the son of Joyce Byers . He is a quiet teenager, an outsider at school, and an aspiring photographer . He is close with his mother and brother, and he becomes the boyfriend of Nancy Wheeler . </Li> <Li> Cara Buono as Karen Wheeler, mother of teenaged Nancy, middle schooler Mike, and toddler Holly . </Li> <Li> Matthew Modine as Martin Brenner, the scientist in charge of Hawkins Laboratory . He is manipulative and remote . He and his team are searching for Eleven . He reappears in season 2 briefly . </Li> <Li> Noah Schnapp as Will Byers, the younger brother of Jonathan Byers and the son of Joyce Byers . He is captured by a monster from the "Upside Down", an alternate dimension discovered by Hawkins Laboratory scientists . Schnapp was promoted to series regular for the second season, after recurring in the first . </Li> <Li> Sadie Sink as Maxine "Max" Mayfield / "Madmax", Billy's younger stepsister, and a tomboy who catches the attention of both Lucas and Dustin . </Li> <Li> Joe Keery as Steve Harrington, a popular high school student and the boyfriend of Nancy Wheeler . He ostracizes Jonathan Byers, but later comes to befriend him . He begins as Nancy's boyfriend but breaks up with her in season two . Keery was promoted to series regular for the second season, after recurring in the first . </Li> <Li> Dacre Montgomery as Billy Hargrove, Max's violent and unpredictable older stepbrother . He challenges Steve's popularity . </Li> <Li> Sean Astin as Bob Newby, a former schoolmate of Joyce and Hopper . In season two, he runs the Hawkins RadioShack and is Joyce's boyfriend, putting him at odds with Hopper . </Li> <Li> Paul Reiser as Sam Owens, a Department of Energy executive . He replaces Brenner as director of Hawkins Laboratory . He is stubborn and committed to scientific research, yet empathetic to the residents of Hawkins . </Li> </Ul> <Li> Winona Ryder as Joyce Byers, the mother of Will and Jonathan Byers . She is divorced from Lonnie Byers . </Li> <Li> David Harbour as Jim Hopper, chief of Hawkins Police Department . After his young daughter died of cancer, Hopper got divorced and lapsed into alcoholism . </Li> <Li> Finn Wolfhard as Mike Wheeler, son of Karen and Ted, younger brother of Nancy, and one of three friends of Will Byers . He is an intelligent and conscientious student and is committed to his friends . He falls in love with Eleven . </Li>

What happened to the missing kid in stranger things