It all began with a goatee-wearing Spock (Leonard Nimoy) in the <em>Star Trek</em> Mirror Universe. The concept of the Mirror Universe within Star Trek premiered in 1967, and it didn’t just introduce parallel worlds to sci-fi television—it essentially invented the visual language of the evil counterpart. The iconic Mirror Universe will forever be known as the multiverse genre’s godfather, but that concept has only shown up as a recurring guest star across different eras and shows—rarely as the main character.
The same is true for Doctor Who, a show that has happily hopped into parallel worlds for decades now but treats them more like vacation destinations than home addresses. While the show is a landmark, in this list, we’re celebrating those that didn’t just visit the multiverse but found a home and made it their storytelling engine. These are the greatest sci-fi shows with parallel universes, ranked from lighthearted escape to emotional ruin.
9
‘Sliders’ (1995–2000)
Sliders is an accessible, entry-level parallel universe show, and it earns its place as the tenacious trailblazer that walked so others could run. It was never the most sophisticated version of the concept; the later seasons, in particular, leaned heavily on camp, while behind-the-scenes chaos and mid-show changes saw key cast members leaving. It was canceled after five seasons, but for what it’s worth, we can’t mention the history of multiverse television without mentioning this scrappy little show. Ambitiously written, Sliders was one of the shows that made folks in the ’90s fall in love with sci-fi.
Sliders follows brilliant graduate student Quinn Mallory (Jerry O’Connell), who invents a device to travel between parallel Earths. While at first, he and his ragtag group of friends hop over to parallel worlds seamlessly, the tech malfunctions and forgets their real dimension. Every episode brings a new "what if" into the mix, from Soviet-controlled America and a dinosaur-populated Earth to a world where time runs backwards, transforming philosophical thought experiments into Saturday afternoon adventure.
8
‘Dark Matter’ (2024–Present)
Dark Matter is less about jumping between wildly different Earths and more about the creeping terror of infinite roads not taken. The protagonist goes through an infinite number of “what ifs,” which sometimes turns into a terrifying metaphor for the paralysis of regret. The series, starring Joel Edgerton in a dual role and Jennifer Connelly as the woman at the center of the drama, is a tightly written paranoid thriller that, while seemingly predictable, never reveals its next move.
Dark Matter is based on Blake Crouch‘s novel of the same name (Crouch also wrote the show’s script). It follows physics professor Jason Dessen (Edgerton), a well-off family man who is kidnapped, drugged, and awakens in an alternate Chicago where he is celebrated as a scientific genius—but his wife is not his wife. The kicker? He was kidnapped by another version of himself, a Jason who had made a different romantic choice fifteen years before and created a machine that opens doors to distinct, fully realized parallel universes. If you like this premise, Dark Matter promises a hard sci-fi story that will make you consider your own “what ifs.” Season 2 is coming soon, and it will go beyond the novel’s conclusion, making this a box that is just being opened.
7
‘The Man in the High Castle’ (2015–2019)
The Man in the High Castle is not a show about scientists hopping through a multiverse; rather, it is a slow-burn espionage thriller in which knowledge of another reality is the most dangerous weapon possible. The series deserves its place because it successfully combines high-concept sci-fi with a grounded, character-driven story about fascism and resistance. Its parallel universe element is powerful, albeit sparingly used, and the show is first and foremost a dystopian masterpiece, then a multiverse story. However, the multiverse aspect is central to its resistance, making it difficult to separate from the genre.
The Man in the High Castle, based on Philip K. Dick‘s novel of the same name, is a dystopian nightmare that introduces one of the most chilling “what ifs” in modern history: what if the Axis powers won World War II? The series is set in a meticulously imagined 1960s America ruled by Japanese and Nazi forces, and it features various characters from both the resistance and the establishment. When a parallel universe is discovered in mysterious film reels, including one in which the Allies triumph, the films become a form of contraband and spiritual totems that prove a better world exists somewhere—igniting the desire to fight. The Man in the High Castle is not your typical parallel universe show, but it’s one of the best.
6
‘Rick and Morty’ (2013–Present)
It’s almost cheating to include Rick and Morty, because the show is more akin to Doctor Who—until a very specific point when its protagonists settle in a parallel universe. Rick Sanchez (Justin Roilandand Ian Cardoni) owns a portal gun allowing him to travel to a new universe every week. However,his actions force him and his family to permanently abandon their original dimensionand move to a replacement one. Thisdoesn’t just happen once either but twiceand Rick’s family now has to inhabit multiple alternate universes.
Rick and Mortyfollows Rick ,the most intelligent man in the universe ,and his meek grandson Morty (Roiland and Harry Belden), whotravel between realities and engage in various adventures and mishaps ;most of the show focuses on their individual journeys ,but some parts have an impact on bigger picture . Their multiverse hopping is fact that show uses create everything from wildly inventive sci-fi concepts to darkest possible nihilistic comedy . Multiverse botha playground and an existential loophole ;Rick and Mortyisn’t about settling into one parallel world but about nihilistic freedom knowing no single reality matters .
