1. Battlestar Galactica
A re-imagining of the original series in which a "rag-tag fugitive fleet" of the last remnants of mankind flees pursuing robots while simultaneously searching for their true home, Earth.
It has an average vote of 8.189 on TMDB.
2. Firefly
In the year 2517, after the arrival of humans in a new star system, follow the adventures of the renegade crew of Serenity, a "Firefly-class" spaceship. The ensemble cast portrays the nine characters who live on Serenity.
It has an average vote of 8.33 on TMDB.
3. 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 8.1 on TMDB.
4. 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.
5. Breaking Bad
Walter White, a New Mexico chemistry teacher, is diagnosed with Stage III cancer and given a prognosis of only two years left to live. He becomes filled with a sense of fearlessness and an unrelenting desire to secure his family's financial future at any cost as he enters the dangerous world of drugs and crime.
It has an average vote of 8.907 on TMDB.
6. 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.
7. Fringe
FBI Special Agent Olivia Dunham, brilliant but formerly institutionalized scientist Walter Bishop and his scheming, reluctant son Peter uncover a deadly mystery involving a series of unbelievable events and realize they may be a part of a larger, more disturbing pattern that blurs the line between science fiction and technology.
It has an average vote of 8.1 on TMDB.
8. Lost
Stripped of everything, the survivors of a horrific plane crash must work together to stay alive. But the island holds many secrets.
It has an average vote of 8 on TMDB.
9. Star Trek: Enterprise
During the mid-22nd century, a century before Captain Kirk's five-year mission, Jonathan Archer captains the United Earth ship Enterprise during the early years of Starfleet, leading up to the Earth-Romulan War and the formation of the Federation.
It has an average vote of 7.6 on TMDB.
10. The X-Files
The exploits of FBI Special Agents Fox Mulder and Dana Scully who investigate X-Files: marginalized, unsolved cases involving paranormal phenomena. Mulder believes in the existence of aliens and the paranormal while Scully, a skeptic, is assigned to make scientific analyses of Mulder's discoveries that debunk Mulder's work and thus return him to mainstream cases.
It has an average vote of 8.4 on TMDB.
11. Band of Brothers
Drawn from interviews with survivors of Easy Company, as well as their journals and letters, Band of Brothers chronicles the experiences of these men from paratrooper training in Georgia through the end of the war. As an elite rifle company parachuting into Normandy early on D-Day morning, participants in the Battle of the Bulge, and witness to the horrors of war, the men of Easy knew extraordinary bravery and extraordinary fear - and became the stuff of legend. Based on Stephen E. Ambrose's acclaimed book of the same name.
It has an average vote of 8.514 on TMDB.
12. Heroes
Common people discover that they have super powers. Their lives intertwine as a devastating event must be prevented.
It has an average vote of 7.5 on TMDB.
13. True Blood
Thanks to a Japanese scientist's invention of synthetic, blood vampires have progressed from legendary monsters to fellow citizens overnight. And while humans have been safely removed from the menu, many remain apprehensive about these creatures "coming out of the coffin." Religious leaders, government officials, and vampire fundamentalists around the world have chosen their sides, but in the small Louisiana town of Bon Temps, the jury is still out.
It has an average vote of 7.621 on TMDB.
14. The Walking Dead
Sheriff's deputy Rick Grimes awakens from a coma to find a post-apocalyptic world dominated by flesh-eating zombies. He sets out to find his family and encounters many other survivors along the way.
It has an average vote of 8.118 on TMDB.
15. The Witcher
Geralt of Rivia, a mutated monster-hunter for hire, journeys toward his destiny in a turbulent world where people often prove more wicked than beasts.
It has an average vote of 8.099 on TMDB.
16. The Big Bang Theory
Physicists Leonard and Sheldon find their nerd-centric social circle with pals Howard and Raj expanding when aspiring actress Penny moves in next door.
It has an average vote of 7.897 on TMDB.
17. Star Trek: The Next Generation
Follow the intergalactic adventures of Capt. Jean-Luc Picard and his loyal crew aboard the all-new USS Enterprise NCC-1701D, as they explore new worlds.
It has an average vote of 8.346 on TMDB.
18. 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.
19. True Detective
An American anthology police detective series utilizing multiple timelines in which investigations seem to unearth personal and professional secrets of those involved, both within or outside the law.
It has an average vote of 8.306 on TMDB.
20. Chuck
When Buy More computer geek Chuck Bartowski unwittingly downloads a database of government information and deadly fighting skills into his head, he becomes the CIA's most vital secret. This sets Chuck on a path to become a full-fledged spy.
It has an average vote of 7.7 on TMDB.
21. Futurama
The adventures of a late-20th-century New York City pizza delivery boy, Philip J. Fry, who, after being unwittingly cryogenically frozen for one thousand years, finds employment at Planet Express, an interplanetary delivery company in the retro-futuristic 31st century.
It has an average vote of 8.4 on TMDB.