Netflix is still surprised that Stranger Things, a science-fiction series starring five young kids, became a worldwide sensation immediately after it was released. Unlike some of its biggest hits, like House of Cards (which is based on a British series), Stranger Things was an unknown property when it premiered in July of 2016. But it quickly captivated audiences, thanks to its '80s nostalgia and the perfectly executed homages to Hollywood classics from the likes of Stephen King and Steven Spielberg.