article: Parallel universe (fiction)
links: Roman Empire Confederate States of America H. G. Wells Earth Spock American Civil War Luigi Arrowverse Flash (DC Comics character) James T. Kirk Emma Swan Frankenstein Flatland Strange Case of Dr Jekyll and Mr Hyde A Modern Utopia The Flash Snow White Vikings Marvel Cinematic Universe The Chosen One (trope) Mirror Universe Extinction Twenty Thousand Leagues Under the Sea Super Mario Bros. (movie) Mario Once Upon a Time (TV series) DC Comics Dinosaur Moby-Dick