Parallel universes have been a sci-fi staple since a goatee-wearing Spock first appeared in Star Trek's Mirror Universe back in 1967. That iconic episode didn't just introduce the concept of alternate realities to television—it practically invented the visual language of evil counterparts. But while shows like Star Trek and Doctor Who have treated parallel worlds as occasional pit stops, the series on this list make the multiverse their permanent home. These are the best sci-fi shows about parallel universes, ranked from lighthearted fun to emotionally devastating.
9. Sliders (1995–2000)
Sliders is the scrappy trailblazer that walked so others could run. It follows brilliant grad student Quinn Mallory (Jerry O'Connell), who invents a device to travel between parallel Earths. When the tech malfunctions, he and his ragtag group get stranded, hopping from one alternate reality to another each week. From a Soviet-controlled America to a dinosaur-populated Earth, every episode turned a philosophical "what if" into a Saturday afternoon adventure. It wasn't the most sophisticated show—later seasons leaned heavily into camp, and behind-the-scenes chaos led to key cast departures—but it made a generation fall in love with sci-fi. For fans of forgotten 90s cult classics, this one's a nostalgic gem.
8. Dark Matter (2024–Present)
Apple TV's Dark Matter isn't about hopping between wildly different Earths—it's about the creeping terror of infinite roads not taken. Based on Blake Crouch's novel (Crouch also wrote the script), the series stars Joel Edgerton in a dual role and Jennifer Connelly. Physics professor Jason Dessen is kidnapped, drugged, and wakes up in an alternate Chicago where he's celebrated as a genius—but his wife isn't his wife. The kidnapper? Another version of himself who made a different romantic choice 15 years earlier and built a machine that opens doors to parallel universes. This tightly written paranoid thriller turns regret into a literal nightmare. Season 2 is coming soon and will go beyond the novel, making this a box just being opened.
7. The Man in the High Castle (2015–2019)
Based on Philip K. Dick's novel, The Man in the High Castle is a slow-burn espionage thriller set in a 1960s America ruled by Nazi and Japanese forces after the Axis won World War II. The parallel universe element is sparingly used but powerful: mysterious film reels reveal a reality where the Allies triumphed, turning the films into contraband and spiritual totems that ignite resistance. This dystopian masterpiece uses the multiverse not for spectacle but as a weapon of hope. It's first a character-driven drama about fascism and resistance, then a sci-fi story—but the two are inseparable.
6. Rick and Morty (2013–Present)
It's almost cheating to include Rick and Morty because the show is more like Doctor Who—until its protagonists permanently settle in a parallel universe. Rick Sanchez's portal gun lets him travel to a new reality every week, but his actions force his family to abandon their original dimension and move to a replacement one. Twice. The show follows the most intelligent man in the universe and his meek grandson Morty on adventures that range from hilarious to existentially horrifying. While most episodes are standalone, the multiverse hopping has real consequences, making it a rare comedy that earns its emotional weight.
These shows prove that parallel universes aren't just a gimmick—they're a storytelling engine that can explore regret, hope, and the infinite possibilities of choice. Whether you prefer campy adventures or hard sci-fi, there's a multiverse out there waiting for you.
