After the introduction of Vecna in Stranger Things Season 4, it might be time for the Duffer brothers to switch up enemies in Season 5. For the majority of Stranger Things, the terrifying creatures of the Upside Down have been largely identical. Save for a few different species, the Demogorgon, Demodogs, and Demobats, all share similar traits. As they are all part of the Mind Flayer hivemind, and by extension, Vecna, it isn't surprising that these monsters share the same likeness. For the final season, the Duffer brothers have to pull out all the stops for the creatures of the Upside Down and introduce some new faces to fight Eleven and the Hawkins gang.