Netflix's "Stranger Things" quickly became a hit after it premiered nearly 10 years ago in 2016. Much of the cast grew up with the show during its run. From Millie Bobby Brown, Joe Keery, Finn Wolfhard and more, here’s a side-by-side look at the "Stranger Things" cast in season 1 and season 5. Sadie Sink's first appearance on the show was in season 2.