The BEST episodes of Alien Worlds

Every episode of Alien Worlds ever, ranked from best to worst by thousands of votes from fans of the show. The best episodes of Alien Worlds!

Applying the laws of life on Earth to the rest of the galaxy, this series blends science fact and fiction to imagine alien life on other planets.

Last Updated: 7/26/2025Network: NetflixStatus: Ended
Atlas
star
7.41
236 votes

#1 - Atlas

Season 1 - Episode 1 - Aired 12/2/2020

On Exoplanet Atlas, dense gravity creates a thick atmosphere allowing airborne life forms to thrive - but also providing a lesson in adaptability.

Watch Now:Amazon
Janus
star
7.39
171 votes

#2 - Janus

Season 1 - Episode 2 - Aired 12/2/2020

Ants, scorpions and fireflies provide clues for biologists to conjecture about life on exoplanet Janus, including highly adaptable pentapods.

Watch Now:AmazonApple TV
Eden
star
7.39
156 votes

#3 - Eden

Season 1 - Episode 3 - Aired 12/2/2020

Twin stars create an oxygen-rich atmosphere on Eden, where a teeming biosphere may parallel seasonal cycles of predation and reproduction o Earth.

Watch Now:Amazon
Terra
star
7.32
156 votes

#4 - Terra

Season 1 - Episode 4 - Aired 12/2/2020

A hyperadvanced species makes their home on doomed exoplanet Terra, which orbits an aging star. Now they must colonize another world, using robots.

Watch Now:Amazon