Nancy Wheeler is a fictional character from the Netflix television show Stranger Things, portrayed by Natalia Dyer. Nancy is the sister of Mike Wheeler and the ex-girlfriend of Steve Harrington. Nancy starts investigating the disappearance of Will Byers when her friend Barbara Holland goes missing as well. She teams up with her future boyfriend Jonathan Byers to investigate Will and Barbara's disappearance, which leads to her discovery of the Upside Down. Nancy is also a playable character in the game "Dead by Daylight".