Did you catch this in Stranger Things? Vol. 2's final two episodes are jam-packed with action, did you spot a recognizable weapon amid the carnage? The Atlantean sword that Hopper used to defeat the Demogorgon in the final episode is the same one that Arnold Schwarzenegger memorably wielded in the "Conan the Barbarian" movies, as David Harbour revealed on his personal Instagram page. The opening episode of Season 4 contained several hints about this grand swordfight, as noted by fans. An advertisement for "Conan the Barbarian" can be seen up on Mike's wall when we catch a glimpse of his bedroom.