6 Great Sci-Fi Shows With Over 100 Episodes (& Where To Stream Them)

Science fiction has a dedicated fanbase, but it can be hit or miss. When you commit to a sci-fi show, especially one that runs for many episodes, it needs to be truly rewarding. The best ones earn your investment by creating immersive worlds, unique stories, and compelling characters that keep you wanting more – making it hard to stop watching after just one episode.

I have to admit, these shows aren’t perfect – they occasionally have a weak episode or two, which is understandable when they’ve been running for so long! But overall, they’re just so good that I’m truly happy I discovered them. That’s why I’ve picked out 7 sci-fi series that really went the distance, with enough story to keep going and going – you absolutely won’t regret spending time with these shows.

6) The 100

The TV show The 100 consists of 100 episodes and is set after a global nuclear disaster. The premise involves sending a group of one hundred young adults from a space station back to Earth to determine if it’s livable again. While it initially attracted viewers, some science fiction fans were hesitant, fearing it would be a typical teen drama about the end of the world. The show does begin that way, but it quickly evolves into a more suspenseful thriller, with political conflicts adding to the drama.

The show’s biggest strength is its constant escalation – every choice matters, and characters quickly find themselves in morally complex situations. The 100 consistently reinvents itself, changing its villains, locations, and even its sense of right and wrong. While not every storyline is perfect, this willingness to take risks is what makes it so captivating. Just when you think you know where the story is going, it throws unexpected twists at you – from internal conflicts and religious fanaticism to widespread destruction and the sudden introduction of artificial intelligence.

The 100 is available to buy on Prime Video.

5) Stargate SG-1

Okay, let me tell you about Stargate SG-1. This show is just pure, unadulterated fun. It’s a sci-fi adventure packed with action, weird planets, and all sorts of aliens, and honestly, it doesn’t try to be anything it isn’t. That’s a huge part of its appeal – it’s a really easy, enjoyable watch. And surprisingly, it still holds up today! The premise is simple: a military team travels through a portal to other worlds, and the stories blend ancient Egyptian mythology with classic sci-fi tropes. It always knew exactly who it was made for, and it delivers on that promise. If you’re looking for something lighthearted and adventurous, this is it.

It takes a little while to get into, but once Stargate SG-1 hits its stride, it’s incredibly addictive. The show maintains a great pace that keeps you hooked. While not every episode is perfect, it stands out from many newer sci-fi shows because it’s enjoyable, comfortable viewing and creates a vast, immersive universe. Plus, it’s not all just fun and games – when the story demands it, the show delivers genuinely serious and compelling moments, particularly in its longer storylines.

Stargate SG-1 is available to stream on Netflix.

4) Doctor Who

Doctor Who is a sci-fi classic that most people are familiar with, and with over 40 seasons, it can seem daunting to start watching. But the great thing is, you don’t need to watch it all! You can jump in at any point, choose a Doctor you like, and begin there. The show centers around an alien called the Doctor who travels through time and space in a ship called the TARDIS, often with human friends, and constantly encounters monsters, conflicts, strange puzzles, and deeply emotional situations.

Okay, so as a huge sci-fi fan, let me tell you, Doctor Who is a wild ride. It can be unbelievably clever, but then suddenly super cheesy, and yet… it still manages to pack an emotional punch that really gets to you. What I love most is that it never runs out of ideas. But the real stroke of genius? Regeneration. It lets them switch out the Doctor’s face and change the vibe of the show without losing all the history. Seriously, you can jump around and find episodes that are terrifying horror, classic adventures, or just completely heartbreaking – and it’s all still Doctor Who. It’s amazing.

Doctor Who is available to buy on Prime Video.

3) Star Trek: The Next Generation

Star Trek: The Next Generation is often considered the peak of the franchise. The show centers on the adventures of the USS Enterprise-D and its captain, Jean-Luc Picard (Patrick Stewart), as they explore the galaxy, encounter new alien cultures, and navigate complex political situations – including the terrifying Borg. While the first few episodes might feel a bit dated, once the series finds its footing, it delivers everything fans love about Star Trek: exciting space exploration, thought-provoking ethical questions, and a memorable cast of characters.

What truly makes this production special is that it doesn’t just rely on action to keep viewers engaged. It cleverly uses its setting to explore what it means to be human. Data, played by Brent Spiner, isn’t simply the ship’s android; he’s a brilliant way for the series to delve into complex questions of consciousness and identity. The Next Generation is sophisticated and intelligent science fiction, but it remains warm and accessible. It’s thoughtful without being dull, and it’s reliably thrilling when the story calls for it.

Star Trek: The Next Generation is available to stream on Paramount+.

2) Futurama

You’ve probably come across a Futurama meme online, even if you don’t know the show itself. But don’t mistake it for just another silly animated comedy. It’s actually one of the smartest and funniest sci-fi series out there. The premise is simple: a regular guy from 1999 is frozen and wakes up in the year 3000, where he becomes a space delivery worker. From there, things get wonderfully chaotic. It’s hilarious, but it also really gets what makes science fiction great.

Futurama isn’t just set in the future for looks – it dives deep into complex concepts like time travel, paradoxes, and alternate realities, even incorporating math, all while remaining genuinely funny. What truly makes the show special is its emotional core; it’ll have you laughing one minute and feeling surprisingly touched the next. Characters like Bender and Leela are key to its enduring appeal, helping it overcome cancellations and return for multiple seasons. It’s a unique blend of smart science fiction, hilarious comedy, and heartfelt storytelling.

Futurama is available to stream on Hulu.

1) The X-Files

The X-Files is a hugely influential science fiction show, and it’s easy to see why it ran for over 200 episodes and is getting a new life. The series follows FBI agents Fox Mulder and Dana Scully as they investigate strange occurrences – from unexplained phenomena and alien sightings to hidden government secrets. It created a unique atmosphere of suspense and mystery, making viewers feel like there’s more to the world than meets the eye. Even when the overarching story had its weak points, the show consistently delivered strong, self-contained episodes that felt like mini-movies in the horror and sci-fi genres.

The show’s success largely comes down to the relationship between the two main characters: Mulder is a true believer, while Scully is a skeptic, and that contrast really draws viewers in. Beyond that, The X-Files pioneered the “monster of the week” format, proving it could be compelling without feeling unimportant. It also fostered a dedicated fanbase that loves to analyze, question, and search for hidden meanings – a type of online engagement that the show arguably helped create.

The X-Files is available to stream on Hulu.

What are your thoughts on these shows? Share your opinions in the comments and join the discussion on the ComicBook Forum!

https://comicbook.com/tv-shows/list/7-sci-fi-shows-that-ended-on-infuriating-cliffhangers/embed/#

2026-05-01 01:13