Millie Bobby Brown shares that it was hard to lose some of her Stranger Things co-stars after their characters’ deaths–including Papa (Matthew Modine) and Billy Hargrove (Dacre Montgomery). Stranger Things is a popular sci-fi Netflix series created by the Duffer Brothers. It follows a group of children\ as monsters from a supernatural world called the Upside Down begin to disrupt their lives as they grow into being teenagers. Brown stars as Eleven, a young girl who acts as the catalyst for the show’s storyline. The series aired its fourth season this past summer, and Stranger Things season 5 will be the last of the series.

Papa and Billy Hargrove are some of the show’s biggest antagonists. Papa, or Dr. Martin Brenner, is the character who kidnaps Eleven after her mom's death and prior to where the show’s storyline begins. At the end of Stranger Things season 4, Papa...