The source provides an extensive overview of the character Vecna, the primary antagonist of Stranger Things, detailing his origin and development both within the show and in real-world production. It explains that the Duffer Brothers based Vecna on a terrifying Dungeons & Dragons lich, but transformed him into the human Henry Creel (Patient One), whose backstory was revealed through a massive retcon in Season 4. The episode thoroughly describes the five-hour prosthetic design process, noting influences like Freddy Krueger and the Hellraiser Cenobites, and analyzes Vecna's narcissistic and ideological psychology of "liberation through murder." Finally, the source touches upon the character's role in the Upside Down time-loop, his suspected subordination to the Mind Flayer, the surprising success of Kate Bush’s “Running Up That Hill,” and hints at his final fate in the upcoming final season.