[Season 2&3] In the beginning, test subject 001, wasn't always a test subject. Her name was Mary Louise Hopper. She was taken as a child and miraculously returned when Will Byers was taken to the upside down alongside a girl who was named 011. Fighting alongside her and her new friends, she reunited with her father and brings a new member into her family. But when a new boy comes to town, does Mary even realize what she's gotten herself into when she decided to be friends with this chaotic Californian dream.