1. 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.
2. Dexter
Dexter Morgan, a blood spatter pattern analyst for the Miami Metro Police also leads a secret life as a serial killer, hunting down criminals who have slipped through the cracks of justice.
It has an average vote of 8.191 on TMDB.
3. 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.
4. 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.
5. Money Heist (La Casa de Papel)
To carry out the biggest heist in history, a mysterious man called The Professor recruits a band of eight robbers who have a single characteristic: none of them has anything to lose. Five months of seclusion - memorizing every step, every detail, every probability - culminate in eleven days locked up in the National Coinage and Stamp Factory of Spain, surrounded by police forces and with dozens of hostages in their power, to find out whether their suicide wager will lead to everything or nothing.
It has an average vote of 8.25 on TMDB.
6. 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.
7. 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.
8. 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.
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. Outlander
The story of Claire Randall, a married combat nurse from 1945 who is mysteriously swept back in time to 1743, where she is immediately thrown into an unknown world where her life is threatened. When she is forced to marry Jamie, a chivalrous and romantic young Scottish warrior, a passionate affair is ignited that tears Claire's heart between two vastly different men in two irreconcilable lives.
It has an average vote of 8.2 on TMDB.
11. The Pacific
Track the intertwined real-life stories of three U.S. Marines – Robert Leckie, John Basilone, and Eugene Sledge – across the vast canvas of the Pacific Theater during World War II. A companion piece to the 2001 miniseries Band of Brothers.
It has an average vote of 7.8 on TMDB.
12. V
A re-imagining of the 1980s miniseries about the world's first encounter with an alien race in which the aliens call themselves The Visitors, and have a seemingly friendly agenda that may or may not be a cover for something more malevolent.
It has an average vote of 6.818 on TMDB.
13. Squid Game (오징어 게임)
Hundreds of cash-strapped players accept a strange invitation to compete in children's games. Inside, a tempting prize awaits — with deadly high stakes.
It has an average vote of 7.831 on TMDB.
14. One-Punch Man (ワンパンマン)
Saitama is a hero who only became a hero for fun. After three years of “special” training, though, he’s become so strong that he’s practically invincible. In fact, he’s too strong — even his mightiest opponents are taken out with a single punch, and it turns out that being devastatingly powerful is actually kind of a bore. With his passion for being a hero lost along with his hair, yet still faced with new enemies every day, how much longer can he keep it going?
It has an average vote of 8.391 on TMDB.
15. Legion
David Haller, AKA Legion, is a troubled young man who may be more than human. Diagnosed as schizophrenic, David has been in and out of psychiatric hospitals for years. But after a strange encounter with a fellow patient, he’s confronted with the possibility that the voices he hears and the visions he sees might be real.
It has an average vote of 7.6 on TMDB.
16. Deadwood
The story of the early days of Deadwood, South Dakota; woven around actual historic events with most of the main characters based on real people. Deadwood starts as a gold mining camp and gradually turns from a lawless wild-west community into an organized wild-west civilized town. The story focuses on the real-life characters Seth Bullock and Al Swearengen.
It has an average vote of 8.103 on TMDB.
17. Carnival Row
In a mystical and dark city filled with humans, fairies and other creatures, a police detective investigates a series of gruesome murders leveled against the fairy population. During his investigation, the detective becomes the prime suspect and must find the real killer to clear his name.
It has an average vote of 7.8 on TMDB.
18. The Sopranos
The story of New Jersey-based Italian-American mobster Tony Soprano and the difficulties he faces as he tries to balance the conflicting requirements of his home life and the criminal organization he heads. Those difficulties are often highlighted through his ongoing professional relationship with psychiatrist Jennifer Melfi. The show features Tony's family members and Mafia associates in prominent roles and story arcs, most notably his wife Carmela and his cousin and protégé Christopher Moltisanti.
It has an average vote of 8.636 on TMDB.
19. 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.
20. The Shield
The story of an inner-city Los Angeles police precinct where some of the cops aren't above breaking the rules or working against their associates to both keep the streets safe and their self-interests intact.
It has an average vote of 8.1 on TMDB.
21. Utopia
The Utopia Experiments is a legendary graphic novel shrouded in mystery. When a group of strangers find themselves in possession of an original manuscript, their lives suddenly and brutally implode.
It has an average vote of 7.989 on TMDB.