Streaming has turned science fiction into television’s most ambitious playground, and the best sci-fi series of the streaming era are the proof. From a German town where a missing boy unravels a century of secrets to a space station where humanity’s future is fought over in three languages, today’s genre shows are bigger, stranger and more confident than anything network television ever attempted. The five series below are the ones we keep returning to, and the ones we recommend first whenever someone asks where to start. They cover time travel, space opera and dystopia, and every one of them is still essential viewing. Begin with Dark, the show that sets the bar for all of them.
Time Travel Done Right: Dark and Severance
Dark (2017) is the most intricately plotted series on this list. Across three seasons and 26 episodes, the Netflix drama follows the disappearance of a boy in the small German town of Winden and spirals outward into a story of families, caves, and timelines that span more than a century. Created by Baran bo Odar and Jantje Friese, and starring Louis Hofmann, it demands your full attention and rewards it with a finale that actually ties its knots together. It is the rare time-travel show that feels planned from the first scene to the last.
Severance (2022) takes a different route into the same territory. Dan Erickson’s Apple TV series follows office workers whose memories have been surgically split between their work selves and their home selves, so neither half knows what the other does. Adam Scott plays Mark Scout, a man grieving his wife on the outside while his severed self slowly starts asking questions on the inside. Across two seasons and 19 episodes, the show turns a workplace mystery into a study of identity, consent and control, and its production design alone makes it one of the most distinctive series of the decade.
Space Opera at Its Best: The Expanse
The Expanse (2015) is the finest space opera of the streaming era, and one of the finest ever made for television. Set in a future where humanity has colonized the solar system and split into Earth, Mars and the Belt, it follows the crew of the Rocinante — Jim Holden, Naomi Nagata and Amos Burton, played by Steven Strait, Dominique Tipper and Wes Chatham — alongside the formidable UN diplomat Chrisjen Avasarala, played by Shohreh Aghdashloo. Across six seasons and 62 episodes, it moves from a missing-person case to a solar-system war without ever losing its grip on the people at its center. Its science feels earned, its politics feel real, and its belter creole is a reminder that worldbuilding is a craft.
Dystopias With Something to Say: Andor and Fallout
Andor is the most grown-up thing Star Wars has ever produced. Rather than lightsaber duels, it gives us the slow, grinding work of building a rebellion: prison labor, bureaucratic cruelty, and ordinary people deciding how much they are willing to risk. It treats its audience like adults and is better for it, which is why it belongs on any list of the era’s great science fiction, franchise label or not.
Fallout (2024) takes the opposite approach and lands just as hard. Set 200 years after a nuclear war, the Prime Video series follows Lucy, played by Ella Purnell, as she leaves her vault for the first time, and the Ghoul, played by Walton Goggins, a gunslinger who has survived the wasteland for centuries. Across two seasons and 16 episodes, it balances pitch-black comedy with genuine horror, and it proves that a video game adaptation can have real storytelling ambition.
How to Watch Them
If you are new to all five, start with Dark and give it three episodes before you judge it; its opening is deliberately slow, and the payoff is enormous. Follow it with Severance, which is shorter and stranger, then move to The Expanse, which rewards patience across its first season before becoming unmissable. Andor and Fallout work in either order, though watching Andor first gives you a grounded political drama before Fallout’s wild, darkly funny wasteland. Fans of supernatural small-town mysteries should also check out Stranger Things, which shares Dark’s love of 1980s atmosphere and hidden worlds. Whichever order you choose, clear your schedule: these are not shows you half-watch.
For cast details, season breakdowns and where to stream it, see our full Dark guide.
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