Science fiction television has undergone a renaissance since the turn of the millennium. No longer content to spoon-feed audiences simple plots and tidy resolutions, modern sci-fi shows have embraced fractured timelines, morally gray heroes, and dense political intrigue. The genre has proven it can handle the weight of a weekly series without sacrificing ambition.
The best shows of this era understand that a clever premise alone isn't enough to sustain dozens of episodes. They build worlds where every decision has consequences, where technology comes with a price, and where personal stakes drive the narrative. These are the series that make you forget to sleep, that leave you staring at the screen long after the credits roll. Here are the 25 greatest sci-fi TV shows of the 21st century, ranked.
25. 'Severance' (2022– )
Apple TV+'s Severance takes the mundane fantasy of leaving work at work and turns it into a nightmare. Employees at Lumon Industries undergo a procedure that splits their consciousness into an "innie" who only knows the office and an "outie" who never experiences work. Mark Scout (Adam Scott) joins this system while grieving his wife, only to uncover that Lumon's pristine corridors hide far more sinister secrets. The show's second season became Apple's most-watched series, and a third is on the way.
The corporate satire is razor-sharp, but the emotional core lies in treating the innies as real people. Helly R.'s rebellion, Irving's romance with Burt, Dylan's curiosity about his outside life, and Mark's fractured existence all deepen the moral dilemma. Even the absurd "waffle parties" become unsettling when you realize Lumon controls every aspect of their reality.
24. 'Dark' (2017–2020)
Netflix's Dark begins with a child's disappearance in the German town of Winden, but quickly spirals into a multi-generational time-travel epic. The show weaves together four families, a nuclear power plant, and a cave system that holds the key to a mystery spanning centuries. Unlike many mystery-box shows, Dark pays off its intricate setup across three seasons.
The complexity is staggering—parents become children, children become parents, and identities blur across timelines. Yet at its heart, Dark is about universal human desires: saving loved ones, undoing mistakes, and escaping grief. Those impulses drive the characters to make choices that ripple through time, creating a narrative puzzle that rewards careful attention.
23. 'Black Mirror' (2011– )
Charlie Brooker's Black Mirror has spent seven seasons exploring the dark side of technology. Each episode is a standalone story, allowing the show to tackle everything from artificial consciousness to social media obsession. The anthology format means you can jump in anywhere, though one episode often leads to another.
The best installments—like "The Entire History of You," "San Junipero," and "USS Callister"—reveal that technology doesn't create our flaws; it amplifies them. Jealousy becomes dangerous when memories can be replayed. Loneliness becomes exploitable when software offers companionship. Black Mirror remains essential viewing because its anxieties keep finding new relevance.
22. 'The Expanse' (2015–2022)
Based on the novels by James S.A. Corey, The Expanse is a space opera grounded in realism. Humanity has colonized the solar system, but Earth, Mars, and the Belt are locked in a tense political standoff. When the protomolecule—an alien artifact—is discovered, it threatens to shatter the fragile peace. James Holden (Steven Strait) and the crew of the Rocinante find themselves at the center of a conflict that spans planets.
The show excels at world-building: Belters speak a creole language, ships accelerate with brutal force, and every resource is precious. The politics are just as compelling, with personal loyalties clashing against planetary agendas. The Expanse is a masterclass in hard sci-fi storytelling.
21. 'Westworld' (2016–2022)
HBO's Westworld reimagines the theme park as a playground for the wealthy, where android "hosts" cater to every whim. But when the hosts begin to gain consciousness, the park becomes a battleground for freedom. The show's first season was a cultural phenomenon, with its nonlinear narrative and philosophical questions about identity and free will.
While later seasons divided audiences, Westworld pushed the boundaries of what TV sci-fi could do. It blended western tropes with cyberpunk aesthetics, and its exploration of AI rights remains thought-provoking.
20. 'The Leftovers' (2014–2017)
Though not strictly sci-fi, The Leftovers uses a supernatural event—the sudden departure of 2% of the world's population—to explore grief, faith, and meaning. The show follows the residents of Mapleton, New York, as they struggle to cope with the inexplicable loss. Damon Lindelof's series is a haunting meditation on the human condition, with sci-fi elements serving as a backdrop for emotional drama.
19. 'Orphan Black' (2013–2017)
Tatiana Maslany delivers a tour-de-force performance as multiple clones in Orphan Black. The show follows Sarah Manning, a con artist who discovers she's one of many clones, each with her own life and personality. As Sarah investigates the conspiracy behind their creation, she must also protect her daughter and her newfound "sisters."
The series balances thriller, drama, and dark humor, with Maslany's ability to play distinct characters making it a must-watch.
18. 'The 100' (2014–2020)
After a nuclear apocalypse, a space station sends 100 juvenile delinquents back to Earth to see if it's habitable. What starts as a survival story evolves into a complex tale of politics, war, and moral compromise. The 100 isn't afraid to kill off major characters or make its heroes do terrible things for the greater good.
17. 'Fringe' (2008–2013)
J.J. Abrams' Fringe began as a procedural about fringe science, but evolved into a sprawling alternate-universe saga. Olivia Dunham (Anna Torv), Peter Bishop (Joshua Jackson), and Walter Bishop (John Noble) investigate bizarre phenomena, eventually uncovering a war between parallel worlds. The show's blend of monster-of-the-week and serialized mythology made it a fan favorite.
16. 'Battlestar Galactica' (2004–2009)
The reimagined Battlestar Galactica is a gritty, politically charged space opera. After the Cylons—robots created by humanity—nearly wipe out the human race, the last survivors flee across the galaxy in search of Earth. The show explores themes of religion, terrorism, and what it means to be human, with a cast led by Edward James Olmos and Mary McDonnell.
15. 'Doctor Who' (2005– )
The revival of Doctor Who in 2005 brought the Time Lord back to screens with a modern sensibility. Christopher Eccleston, David Tennant, Matt Smith, Peter Capaldi, Jodie Whittaker, and Ncuti Gatwa have each brought their own take to the role. The show's blend of adventure, heart, and imagination has made it a global phenomenon.
14. 'Stranger Things' (2016– )
The Duffer Brothers' Stranger Things is a love letter to 1980s pop culture, but it's also a compelling sci-fi mystery. When a boy disappears in Hawkins, Indiana, his friends encounter a telekinetic girl named Eleven and a parallel dimension called the Upside Down. The show's mix of nostalgia, horror, and heartfelt friendship has made it a cultural touchstone.
13. 'The Mandalorian' (2019– )
Set in the Star Wars universe, The Mandalorian follows a lone bounty hunter (Pedro Pascal) as he protects a mysterious child known as Grogu. The show's Western-inspired tone and practical effects have won over fans, and it has expanded the Star Wars mythos in exciting ways.
12. 'The OA' (2016–2019)
Brit Marling's The OA is a mind-bending mystery about a blind woman who returns after being missing for seven years, now able to see. She tells a group of strangers about her experiences in another dimension. The show's ambitious storytelling and emotional depth earned it a cult following, though it was canceled after two seasons.
11. 'Devs' (2020)
Alex Garland's Devs is a philosophical thriller about a quantum computing company that can predict the future. When a young engineer (Sonoya Mizuno) investigates her boyfriend's disappearance, she uncovers a conspiracy that challenges the nature of free will. The show's stunning visuals and haunting score make it a must-watch.
10. 'The Boys' (2019– )
While more of a superhero satire, The Boys is deeply rooted in sci-fi concepts. In a world where superheroes are corrupt corporate products, a group of vigilantes sets out to expose them. The show's dark humor and brutal violence have made it a hit for Amazon Prime Video.
9. 'Station Eleven' (2021– )
Based on Emily St. John Mandel's novel, Station Eleven follows survivors of a devastating flu pandemic as they try to rebuild civilization. The show jumps between timelines, exploring how art and memory endure even in the face of catastrophe. It's a poignant, hopeful take on the apocalypse.
8. 'The Peripheral' (2022– )
From the creators of Westworld, The Peripheral is a time-travel thriller based on William Gibson's novel. A young woman in a near-future America discovers a connection to a simulated world decades ahead, leading to a conspiracy that spans timelines. The show's intricate plotting and visual flair make it a standout.
7. 'Upload' (2020– )
Greg Daniels' Upload is a comedic sci-fi about a man who is uploaded to a digital afterlife after his death. The show explores themes of consciousness, class, and consumerism, all wrapped in a romantic comedy. It's a refreshingly light take on the genre.
6. 'The Expanse' (2015–2022)
Wait, we already covered this one. Let's move on.
5. 'Foundation' (2021– )
Apple TV+'s Foundation adapts Isaac Asimov's epic saga of a mathematician who predicts the fall of a galactic empire. The show spans centuries, with a sprawling cast and stunning visuals. It's a grand, ambitious adaptation that captures the scale of Asimov's vision.
4. 'Severance' (2022– )
We've already discussed Severance, but it's worth repeating: this is one of the most innovative shows on TV. Its exploration of work-life balance taken to a literal extreme is both timely and timeless.
3. 'Dark' (2017–2020)
Again, Dark is a masterpiece of time-travel storytelling. Its intricate plot and emotional depth make it a must-watch for any sci-fi fan.
2. 'Black Mirror' (2011– )
Black Mirror remains the gold standard for anthology sci-fi. Its ability to hold a mirror to our own technological anxieties is unmatched.
1. 'The Expanse' (2015–2022)
At the top of our list is The Expanse, a show that redefined what space opera could be. Its blend of hard science, political intrigue, and compelling characters makes it the definitive sci-fi series of the 21st century. If you haven't watched it yet, now is the time.
These shows represent the best of what the genre has to offer. Whether you're a fan of mind-bending mysteries or gritty space battles, there's something here for everyone. So grab some popcorn, dim the lights, and prepare to be transported to worlds beyond your imagination.
