8 Game-Changing Sci-Fi TV Shows That Totally Rewrite Genre Rules

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Published Mar 22, 2026, 2:26 PM EDT

Diego Pineda has been a devout storyteller his whole life. He has self-published a fantasy novel and a book of short stories, and is actively working on publishing his second novel.

A lifelong fan of watching movies and talking about them endlessly, he writes reviews and analyses on his Instagram page dedicated to cinema, and occasionally on his blog. His favorite filmmakers are Andrei Tarkovsky and Charlie Chaplin. He loves modern Mexican cinema and thinks it's tragically underappreciated.

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Science fiction is one of the most popular and prolific genres in the history of television, and every new sci-fi show that gets put out nowadays stands on the shoulders of giants. From classics of the genre like The X-Files to groundbreaking modern series like Black Mirror, there have been quite a few sci-fi shows that have defined and redefined the rules of the genre.

These game-changing gems have set up the way science fiction works on the small screen for years. Whether they're establishing a more modern tone for the genre in the digital age, pioneering the sci-fi anthology genre, or establishing an entirely new way in which cable television is made, these are some of the most important and groundbeaking genre shows of all time.

8 'Black Mirror' (2011–Present)

Bryce Dallas Howard staring at a small device in Nosedive episode of Black Mirror.

Black Mirror started airing on the British network Channel 4 during its first two seasons, later moving on to Netflix. It's in the streaming giant that it has found its perfect new home, where it has established itself as one of the heaviest sci-fi shows currently being produced. As much of a spiritual successor to The Twilight Zone as it is an exquisitely unique anthology series in its own right, it's undoubtedly one of the best genre shows on streaming.

Like any sci-fi anthology series, Black Mirror isn't without its share of duds, but, for the most part, its episodes are some of the most interesting, creative, and profound stories sci-fi is telling on the small screen nowadays. Carrying the Twilight Zone torch with pride, its every new season works as a timely, nothing-short-of-eerie reflection of the sociopolitical fears and techno-paranoia that ail contemporary society.

7 'Lost' (2004–2010)

Matthew Fox as Jack Shepard lying in the bamboo forest in the pilot of Lost — Matthew Fox as Jack Shepard in Lost

Throughout the entire time that it was on the air, it felt like everyone and their grandmother were watching Lost. This truly was one of the biggest pop-cultural sensations of the 2000s, and it also happens to be one of the most game-changing TV drama shows of all time. But more than anything else, it was the rules of sci-fi that Lost completely re-wrote.

Lost popularized a far more serialized and genre-heavy version of the "mystery box" show, a genre of high-concept fiction featuring complex stories based on secrets, surprises, and twists. By blending high-concept sci-fi with intense character-driven drama (bolstered by one of the greatest and biggest cast ensembles in the history of sci-fi TV), it showed the heights that a series with a high budget could reach in the 21st century.

6 'Battlestar Galactica' (2004–2009)

If there was any TV series from the '70s that desperately needed a remake, it was Battlestar Galactica. After the exceptional 2003 miniseries of the same name, the 2004 show didn't only improve upon everything that its predecessor did: It completely changed the name of the game in 21st-century science fiction. Dwight Schrute is to be believed: This is one legendary sci-fi series.

By either subverting or altogether doing away with the typical tropes of space opera shows, Battlestar Galactica showed how a dark, gritty, politically charged sci-fi show could succeed in the modern era. That's what has kept it as one of those classic sci-fi shows that are still relevant. Deeply influenced by the new reality and the changed television business that came after 9/11, Battlestar pushed sci-fi television in a grittier, more serialized, and more character-driven direction than ever seen before.

5 'The X-Files' (1993–2018)

THE X-FILES, Gillian Anderson, David Duchovny, 1993-2002. photo: Chris H.B. / © Fox Network / Courtesy: Everett Collection

Anyone who loves science fiction television knows, or quite likely has seen at least a few episodes of, Chris Carter's The X-Files. It's one of those rare sci-fi shows that get better with every rewatch, in no small measure thanks to how enthralling to watch Mulder and Scully are—and how incredible David Duchovny and Gillian Anderson are in the roles.

Perhaps more than for anything else, X-Files was revolutionary for it pioneered digital telecommunication technologies (which were starting to become mainstream when it began airing) in creating one of the biggest cult followings of any series on the planet at the time. As if that weren't enough, it has also proved massively influential over the years, with several fantasy and sci-fi shows released since 1993—from Supernatural to Fringe—wearing their X-Files influences on their sleeves.

4 'Doctor Who' (1963–1989)

Tom Baker as the Fourth Doctor pointing while surrounded by Daleks in Doctor Who

Despite the hiatus that it went through between 1989 and 2005 and the fact that it has seen two revivals, Doctor Who is nevertheless considered the longest-running sci-fi TV show in history. After more than 60 years on the air, the sci-fi show has become such an integral part of the pop culture world that it's hard to measure its importance. It doesn't take too much analysis, though, to call Doctor Who one of the most groundbreaking genre shows of all time.

What started as an educational series mainly aimed at children slowly started transforming into what it is today: A time-traveling sci-fi spectacle for all ages that serves as a celebration of the genre itself. The original series, in particular, was one of those sci-fi shows that were far ahead of their time, both due to how progressive it always was and due to the concept of regeneration. The show found that if they had their main character have the ability to transform into a new body every time they died, the show would remain forever fresh and able to renew itself. So far, the decision has worked flawlessly.

3 'Star Trek: The Original Series' (1966–1969)

Spock (Leonard Nimoy) and Kirk (William Shatner) on an alien planet in 'Star Trek: The Original Series'

Star Trek is a franchise that needs no introduction, but everything has to start somewhere. In the case of this beloved sci-fi property, that "somewhere" was 1966's Star Trek: The Original Series, which has aged beautifully as one of the best TV shows of the '60s. Science fiction wouldn't be what it is today without this franchise, and, by proxy, it wouldn't be what it is today without this incredibly important show.

Aside from having what was easily the most diverse cast of any mainstream genre show at the time of its airing, Star Trek: TOS was always ahead of the curve when it came to being progressive. On top of that, it showed that space-based science fiction could approach its reflections on the real world with hope and optimism, rather than just spectacle. This approach has aged like fine wine, and it's what has kept Star Trek endlessly relevant throughout all these years.

2 'The Twilight Zone' (1959–1964)

Rod Serling delivers opening narration from the top of the cylinder in The Twilight Zone episode "Five Characters in Search of an Exit."

Not only is Rod Serling's The Twilight Zone perhaps the best-ever five-season sci-fi show, but also the most influential sci-fi show of all time. It's not just anthology series like Black Mirror that are forever indebted to Serling's timeless creation: From Twin Peaks to The Truman Show and from Jordan Peele to Stephen King, all sorts of shows, movies, and artists over the years have been inspired by The Twilight Zone.

For the longest time, science fiction had been looked down upon by critics and mainstream audiences as a low-brow genre meant for kids. Suddenly, with The Twilight Zone on the air, people began to see that sci-fi could be elevated to a serious, intelligent medium to explore thought-provoking themes, contemporary social issues, and the nature of the human condition. No sci-fi fan has looked back since.

1 'Babylon 5' (1993–1998)

babylon-5-sheridan-delenn — Commander Sheridan running the show.

Babylon 5 may just be the single most ambitious sci-fi TV show in history, and as such, it has to also be considered the most game-changing series in the genre's history. That's definitely not a hard label to attach to it. The show was designed as a novel for television with five pre-planned season story arcs, where each episode would serve as a new chapter. This kind of serialized television storytelling was incredibly rare for American broadcast television at the time, regardless of genre.

That makes Babylon 5 not only one of the most rule-defining sci-fi shows in history, but just one of the most historically groundbreaking shows in general. 28 years after its conclusion, not everything about it has aged the best, but even the elements that feel a bit dated have a certain kind of campy charm to them that's impossible to imitate or resist. All serialized science fiction shows that have come after Babylon 5 are, to some degree, indebted to it.