Sci-fi has always been one of television’s most ambitious genres, from vintage sci-fi TV shows that are just as good as today’s, to modern streaming epics. Many of these shows have even introduced fans to actors who deserve a place in sci-fi’s hall of fame.

There are shows like Devs, which still serve as excellent sci-fi TV shows you can binge in a day, and longer-running franchises, like Deep Space Nine, that ultimately needed time to find their footing. Some saga-length series, like Lost or Heroes, capture audiences early, then struggle. At the other end of the scale, a series like Dark consistently maintained high-quality storytelling.

Sometimes, if a series is confident enough in its storytelling, it creates a franchise that improves every season, and that’s the case for several notable sci-fi shows.

Orphan Black

Orphan Black started as a high-concept clone thriller, but it didn’t reach its full potential until it leaned into its political mythology. Created by Graeme Manson and John Fawcett, the series became synonymous with Tatiana Maslany’s tour-de-force performance as multiple distinct characters, or “clones.”

In seasons 3 and 4, Orphan Black turned more politically and philosophically complex, deeply exploring bodily autonomy, corporate science, and sisterhood. Rather than stretching its premise thin, Orphan Black expanded its emotional core, as season 5 culminated with giving each clone meaningful closure, making it a must-watch sci-fi series.

Maslany ended up winning the Primetime Emmy Award for Outstanding Lead Actress in a Drama Series in 2016, cementing the show’s critical acclaim. After concluding in 2017 after five seasons, the series returned in the form of a spinoff titled Orphan Black: Echoes, which lasted one season.

Star Trek: The Next Generation

When Star Trek: The Next Generation premiered in 1987, it had the daunting task of following the original 1960s series. Its first two seasons are often criticized for uneven writing and recycled scripts. However, with Patrick Stewart as Captain Jean-Luc Picard, the series quickly became iconic.

By The Next Generation season 3, the series rapidly improved. Stronger character writing for Data, Worf, and Picard elevated the drama, while episodes like “Yesterday’s Enterprise” and “The Inner Light” became franchise classics.

The show won multiple Emmy Awards and remains a cornerstone of science fiction television. Its evolution from tentative reboot to philosophical, character-rich drama solidified The Next Generation as a defining era of Star Trek.

The Expanse

Based on the novels by James S. A. Corey, The Expanse quickly earned a reputation due to its grounded science and political realism. For many, this space opera is perfect from start to finish, an impressive feat since The Expanse lasted six seasons.

While season 1 was a slower burn, seasons 2 and 3 increased the show’s momentum, particularly during the Eros and Ring Gate arcs. The show’s move to streaming allowed for even greater narrative ambition in seasons 4 through 6, adapting Cibola Burn and beyond.

Praised for its attention to astrophysics and complex geopolitics, The Expanse‘s seasons balanced spectacle with character-driven drama.

Babylon 5

Created by J. Michael Straczynski, Babylon 5 brought long-form serialized storytelling to genre television. Set aboard a space station serving as a diplomatic hub, it influenced Star Trek: Deep Space Nine.

The first season premiered in 1994 with standalone political disputes that felt clunky at times. The series gained traction with its commitment to the Shadow War arc.

This five-year setup proved that sci-fi television could sustain cumulative political and character consequences across multiple seasons.

Star Trek: Deep Space Nine

This series premiered in 1993 and shifted away from direct space exploration to support base for Gamma Quadrant. Initially dividing fans used to The Next Generation’s format.

The show evolved into one of the franchise’s most morally complex entries with episodes showcasing layered politics and ethical ambiguity.

The Dominion War arc delivered sustained tension and character growth for figures like Kira Nerys and Gul Dukat.

Fringe

This series began as monster-of-the-week format before growing far beyond its original episodic origins. It focused on investigating strange phenomena often dubbed “Fringe science.”

The show shifted towards continuity-focused storytelling with an alternate universe story arc showcasing emotional depth through evolving dynamics.

Critics praised John Noble’s performance as Walter Bishop throughout its five-season run.

Person Of Interest

This show initially presented itself as a crime procedural centered on an artificial intelligence called “The Machine.”

Latter seasons embraced serialized arcs focused on aspects like artificial intelligence surveillance autonomy.

The themes explored ethics of algorithmic control vs free will becoming increasingly relevant today.

Farscape

This show debuted in 1999 co-produced with The Jim Henson Company known for inventive puppetry bold alien designs.

The story matured into an emotionally resonant high-concept space opera culminating in miniseries titled The Peacekeeper Wars .