10 Best Sci-Fi Shows With Less Than 20 Episodes, Ranked for Every Fan

Short runs, lasting impact

A compact run can give a science-fiction story room to make its point without stretching across hundreds of episodes. The featured series span very different formats, from miniseries to shows with multiple seasons.

The selection excludes ongoing shows, even if they have not yet reached 20 episodes. Each included series has completed its run and stayed within the episode limit.

Loki’s multiverse journey

Loki gave the Marvel Cinematic Universe a focused story centered on one of its widely loved characters. The series ran for two seasons and 12 episodes. Its high-concept multiverse premise and visual production were paired with an emotional conclusion to Loki’s character arc. The show is described as the highest-rated MCU series on Disney+ on IMDb.

Surreal mysteries and time travel

Eerie, Indiana aired for one season and 19 episodes before NBC canceled it, with low ratings and high production costs cited as reasons. Creators José Rivera and Karl Schaefer had envisioned it as a children’s take on Twin Peaks.

Despite its short run, the series developed a cult following and has been praised for its unusual, sometimes frightening approach to children’s television. Life on Mars took a different route, combining a police procedural with supernatural and science-fiction elements.

Matthew Graham and Ashley Pharoah developed the idea for Life on Mars in 1998 as a time-travel story satirizing 1970s society. Broadcasters initially rejected the concept; the series eventually premiered in 2006 and ran for 16 episodes across two seasons.

Watchmen and Utopia’s dark ideas

HBO’s Watchmen, created by Damon Lindelof, was a nine-episode sequel to the influential comic by Alan Moore and Dave Gibbons. Though divisive, the miniseries was praised for carrying the original work’s themes into a 21st-century story.

The show addressed systemic racism and historical trauma, reworking the comic’s philosophical concerns. Utopia, a British conspiracy thriller from Channel 4, ran for two seasons and 12 episodes. Utopia became a cult favorite of 2010s television and was noted for its dark, complex themes and lack of filler episodes.