Official trailer
The first three seasons of The Expanse are the best science fiction television ever made. That’s not hyperbole and it doesn’t require qualification. By the standards that matter, world building, political complexity, character depth, physical realism, sustained narrative tension, nothing else in the genre comes close.
Then Amazon bought it, and the same show with largely the same cast and creative team produced a badly disappointing fourth season.
I haven’t seen seasons five and six. This review covers what I’ve seen. The first three seasons are a 9.5.
Season four is a 4 by itself and only that high because the craft underneath the bad decisions is still visible. This is a review of both: what greatness looks like when it’s working, and what happens to a great show when it stops understanding what made it great.
Physics as Character
Most science fiction treats physics as an obstacle to ignore. Ships bank in turns. Explosions make sound. Gravity is constant and convenient. The Expanse treats physics as the foundation everything else is built on, and that decision changes everything downstream.
In The Expanse, acceleration is the defining variable of interplanetary society.
Ships have to burn to move and burn to stop. Communication between planets has a time delay that makes real-time coordination impossible. Living in low gravity for generations produces bodies that can’t survive Earth’s pull. The Belt’s resource extraction economy exists because of the energy cost of lifting mass out of a gravity well. None of this is explained at you. It’s built into how every character moves, speaks, thinks, and makes decisions.
The result is a world that feels extrapolated instead of invented.
The political tensions between Earth, Mars, and the Belt don’t come from the writers needing conflict. They come from physics and economics operating over generations. Earth has gravity and resources but is politically sclerotic. Mars has discipline and ambition but is three generations from a habitable surface. The Belt has nothing except the labor that everyone else depends on and the accumulated resentment of people treated as expendable. You don’t need a villain to generate that conflict. You need realistic constraints operating over time.
The best world building doesn’t invent problems for characters to solve. It extrapolates conditions that generate problems automatically.
Political Drama That Feels Real
The political architecture of The Expanse is the show’s second great achievement. The tension between Earth, Mars, and the Belt is the story. The Rocinante crew’s personal struggles are interesting because they’re playing out against a solar system on the edge of war, and the war is interesting because every faction’s position is comprehensible.
Chrisjen Avasarala is the best political character in recent science fiction television, and she’s my favorite person in the show. She’s calculating, ruthless, profane, and entirely committed to a version of the greater good that requires her to do things she finds personally repugnant. She’s doing a hard job in a system that punishes idealism and rewards cynicism, and she’s made her peace with that without losing sight of why it matters. I could watch her work a room all day. Her scenes work because the show trusts that complexity without explaining it.
You understand her position by watching her maneuver.
The Belt factions are equally well-handled. The Belter independence movement is coded as a natural consequence of exploitation, and that’s more unsettling than either framing.
The OPA works with a logic that’s internally consistent and externally disturbing. When Belter characters make decisions that horrify Earth characters, the horror is never cheap. You understand exactly why they got there.
Characters Who Deserve Their Place
The Rocinante crew is the emotional center of the show, and they work because each one fills a role the narrative requires. Holden is the moral compass who keeps getting it wrong in ways that cost people their lives. His idealism is presented as a flaw that produces real consequences. That makes his eventual commitment to harder choices feel deserved instead of convenient.
Naomi’s backstory unfolds slowly and deliberately, and when the full picture assembles it recontextualizes everything that came before. That kind of longitudinal character work is hard to do in television because it requires the writers to know where they’re going long before the audience does. The Expanse knew. The payoff is real.
Amos is the most interesting character in the show and the most carefully written, and he’s the one I remember longest. He’s operating with a moral structure he assembled from scratch after a childhood that gave him nothing to work with, and the seams show. Calling him a sociopath misses what the writers built: a man who constructed his ethics deliberately, so they have gaps where absorbed ethics wouldn’t. I like that the show reveals all this through behavior and never hands you a speech about it.
You work out what’s happening inside him by watching what he does in situations that other characters handle on instinct.
Amos Burton is what happens when a writer understands the mechanism of a psychology instead of just the label. The behavior is specific because the interior is specific. One follows from the other.
Subtext That Drives the Story
The Expanse never stops to explain what it’s about. The show embeds the class dynamics between Earth, Mars, and the Belt in how characters speak, what they eat, how their bodies move, what they assume about each other, and what they consider an insult. It builds the Belter creole language from the linguistic debris of communities thrown together under pressure, and that’s how real contact languages develop.
The water rationing behaviors, the low-gravity workout regimens, the different relationship to vacuum and radiation: all of it is shown through detail.
This is the craft achievement that most separates The Expanse from comparable shows. The societal critique is real and pointed, resource extraction, labor exploitation, the casual cruelty of comfortable people toward desperate ones, but it arrives through accumulation instead of declaration. By the time the audience understands what the show is saying about class and power, they’ve reached that understanding through their own observation. They weren’t told. They noticed.
Audiences resist being told what to think. They embrace conclusions they feel they’ve reached themselves. The Expanse engineers that process systematically across three seasons.
What Amazon Did to It
Season four is a 4 out of 10. From the same show. That gap requires explanation because it’s instructive.
When Amazon acquired The Expanse after Syfy canceled it, they moved the story to Ilus, a newly discovered planet outside the solar system. The Rocinante crew spends the season on one world, dealing with a land dispute between UN colonists and Belter squatters. The interplanetary political tension that generated the first three seasons’ stakes is reduced to subplot. The sense of scale, solar system-wide, civilizational, irreversible, shrinks to a land management problem on a frontier planet.
The physical constraints that made everything feel real were still nominally present.
The craft was still visible in the writing and the performances. But the story had been confined in a way that stripped away the structural elements that made it work. The Rocinante crew thrived in the context of solar system-wide crisis because their personal scale contrasted productively with the political scale. Put them on one planet dealing with one conflict and the productive tension between those scales disappears.
Amazon spent money to save the show and then made decisions that undermined the things worth saving, and that makes me angrier than a show that was bad from the start ever could. The people in charge misread what made the show great and then executed the wrong priorities with total confidence. Seeing the Rocinante crew stuck on one planet arguing over a land dispute felt like watching a racehorse hitched to a plow.
The Collaboration Behind It
The Expanse is based on novels written under the pen name James S. A. Corey, a collaboration between Daniel Abraham and Ty Franck. Abraham brought literary craft and experience with complex multi-threaded narratives. Franck brought world-building instinct and the large-scale political sensibility that makes the series feel like a living system instead of a constructed one.
The collaboration works because the seams don’t show. You can’t read the novels and identify who wrote which section. The voice is unified, the hardest thing to achieve in collaborative fiction and the most important. Two writers producing alternating chapters isn’t collaboration. Two writers producing a single voice is something rarer and more valuable.
The television adaptation maintained that unified vision through the first three seasons. When the show moved to Amazon and the original creative circumstances shifted, the unity fractured. The decline in seasons four onward is partly a story about what happens when the conditions that produced a creative vision change and the vision doesn’t adapt correctly.
Is The Expanse worth watching?
Seasons one through three of The Expanse are as good as science fiction television gets. The world building is rigorous, the politics are credible, the characters carry real weight, and the subtext does serious work without ever stopping the story to announce itself. It’s the standard against which other ambitious science fiction should be measured.
Season four shows how quickly and completely a great show can lose what made it great. The talent was still there, and the cast and writers hadn’t forgotten how to do their jobs. Somebody misread what the show structurally needed, and the conditions that let that talent do its best work were gone. That’s why the season stings so much for me: everything I cared about was still visible, and none of it had room to breathe.
Watch the first three seasons. They’re required viewing for anyone who writes in the genre or studies long-form narrative construction. Watch season four if you want a case study in how structural decisions undermine execution. I haven’t seen five and six. Based on what I’ve read, they partially recover but never return to the heights of the first three seasons. The shortened final season apparently couldn’t land the story in six episodes when it needed ten.
The first three seasons get the 9.5 from me. I’d put Avasarala’s scheming, Amos’s homemade morality and the slow squeeze of the Earth, Mars and Belt politics up against any science fiction show ever made. Everything good in those seasons still stands after season four, and I still wish Amazon had understood what it bought.
For a deeper look at the writing craft behind The Expanse and what makes its storytelling approach a model for ambitious science fiction, see the full analysis at The Writing King.
