1. Galactica 1980
30 years after the original Battlestar Galactica series. Upon reaching Earth, the inhabitants of the renegade starfleet take action when they realize earthlings aren't advanced enough to help battle the Cylons.
It has an average vote of 6.097 on TMDB.
2. Battlestar Galactica
When an old enemy, the Cylons, resurface and obliterate the 12 colonies, the crew of the aged Galactica protect a small civilian fleet - the last of humanity - as they journey toward the fabled 13th colony, Earth.
It has an average vote of 8.217 on TMDB.
3. Star Trek
Space. The Final Frontier. The U.S.S. Enterprise embarks on a five year mission to explore the galaxy. The Enterprise is under the command of Captain James T. Kirk with First Officer Mr. Spock, from the planet Vulcan. With a determined crew, the Enterprise encounters Klingons, Romulans, time paradoxes, tribbles and genetic supermen led by Khan Noonian Singh. Their mission is to explore strange new worlds, to seek new life and new civilizations, and to boldly go where no man has gone before.
It has an average vote of 8.064 on TMDB.
4. Rick and Morty
Rick is a mentally-unbalanced but scientifically gifted old man who has recently reconnected with his family. He spends most of his time involving his young grandson Morty in dangerous, outlandish adventures throughout space and alternate universes. Compounded with Morty's already unstable family life, these events cause Morty much distress at home and school.
It has an average vote of 8.701 on TMDB.
5. Game of Thrones
Seven noble families fight for control of the mythical land of Westeros. Friction between the houses leads to full-scale war. All while a very ancient evil awakens in the farthest north. Amidst the war, a neglected military order of misfits, the Night's Watch, is all that stands between the realms of men and icy horrors beyond.
It has an average vote of 8.447 on TMDB.
6. Westworld
A dark odyssey about the dawn of artificial consciousness and the evolution of sin. Set at the intersection of the near future and the reimagined past, it explores a world in which every human appetite, no matter how noble or depraved, can be indulged.
It has an average vote of 8.057 on TMDB.
7. Sherlock
A modern update finds the famous sleuth and his doctor partner solving crime in 21st century London.
It has an average vote of 8.524 on TMDB.
8. The Expanse
A thriller set two hundred years in the future following the case of a missing young woman who brings a hardened detective and a rogue ship's captain together in a race across the solar system to expose the greatest conspiracy in human history.
It has an average vote of 8.05 on TMDB.
9. Star Trek: Picard
Set twenty years after the events of Star Trek Nemesis, we follow the now-retired Admiral Picard into the next chapter of his life.
It has an average vote of 7.316 on TMDB.
10. Reacher
Jack Reacher, a veteran military police investigator, has just recently entered civilian life. Reacher is a drifter, carrying no phone and the barest of essentials as he travels the country and explores the nation he once served.
It has an average vote of 8.092 on TMDB.
11. The Wheel of Time
Follow Moiraine, a member of the shadowy and influential all-female organization called the “Aes Sedai” as she embarks on a dangerous, world-spanning journey with five young men and women. Moiraine believes one of them might be the reincarnation of an incredibly powerful individual, whom prophecies say will either save humanity or destroy it.
It has an average vote of 7.706 on TMDB.
12. The A-Team
A fictional group of ex-United States Army Special Forces personnel work as soldiers of fortune while on the run from the Army after being branded as war criminals for a "crime they didn't commit."
It has an average vote of 7.5 on TMDB.
13. Timeless
A mysterious criminal steals a secret state-of-the-art time machine, intent on destroying America as we know it by changing the past. Our only hope is an unexpected team: a scientist, a soldier and a history professor, who must use the machine's prototype to travel back in time to critical events. While they must make every effort not to affect the past themselves, they must also stay one step ahead of this dangerous fugitive. But can this handpicked team uncover the mystery behind it all and end his destruction before it's too late?
It has an average vote of 7.2 on TMDB.
14. Cowboy Bebop (カウボーイビバップ)
In 2071, roughly fifty years after an accident with a hyperspace gateway made the Earth almost uninhabitable, humanity has colonized most of the rocky planets and moons of the Solar System. Amid a rising crime rate, the Inter Solar System Police set up a legalized contract system, in which registered bounty hunters, also referred to as "Cowboys", chase criminals and bring them in alive in return for a reward.
It has an average vote of 8.537 on TMDB.
15. Caprica
Set 58 years before Battlestar Galactica, Caprica follows two rival families - the Graystones and the Adamas - as they grow, compete, and thrive in the vibrant world of the peaceful 12 Colonies, living in a society close to our own. Entangled in the burgeoning technology of artificial intelligence and robotics that will eventually lead to the creation of the Cylons, the two houses go toe-to-toe, blending action with corporate conspiracy and sexual politics.
It has an average vote of 6.92 on TMDB.
16. Foundation
Follow a band of exiles on their monumental journey to save humanity and rebuild civilization amid the fall of the Galactic Empire.
It has an average vote of 7.838 on TMDB.
17. Star Trek: Voyager
Pulled to the far side of the galaxy, where the Federation is 75 years away at maximum warp speed, a Starfleet ship must cooperate with Maquis rebels to find a way home.
It has an average vote of 7.808 on TMDB.
18. Stargate SG-1
The story of Stargate SG-1 begins about a year after the events of the feature film, when the United States government learns that an ancient alien device called the Stargate can access a network of such devices on a multitude of planets. SG-1 is an elite Air Force special operations team, one of more than two dozen teams from Earth who explore the galaxy and defend against alien threats such as the Goa'uld, Replicators, and the Ori.
It has an average vote of 8.236 on TMDB.
19. Terminator: The Sarah Connor Chronicles
The series picks up four years after the events of Terminator 2: Judgment Day with John and Sarah Connor trying to stay under-the-radar from the government, as they plot to destroy the computer network, Skynet, in hopes of preventing Armageddon.
It has an average vote of 7.547 on TMDB.
20. Devs
Young computer engineer Lily Chan investigates the secretive development division of her employer, a cutting-edge tech company based in San Francisco, which she believes is behind the murder of her boyfriend.
It has an average vote of 7.4 on TMDB.
21. ThunderCats
The inhabitants of the planet Thundera evacuate just before it is destroyed. They were pursued by a band of mutants. All but one of their escape ships was destroyed. Only a small group of Thunderans remained. With only half engine power, the group, which was led by Jaga, had to set a course for the nearest planet. Jaga commanded their ship while the other seven were in their stasis tubes. Jaga died on their journey to Third Earth and their ship crashed there. Soon they made friends with various groups in the area and they designed a fortress. Mumm-Ra the centuries-old embodiment of evil, along with the mutants that destroyed the rest of the Thunderans are a constant threat. But Lion-O, the new leader of the Thundercats, with his weapon the "Sword of Omens" will help the Thundercats to have a standing chance.
It has an average vote of 8.2 on TMDB.