1. NCIS: Los Angeles
The exploits of the Los Angeles–based Office of Special Projects , an elite division of the Naval Criminal Investigative Service that specializes in undercover assignments.
It has an average vote of 7.6 on TMDB.
2. Hawaii Five-0
Steve McGarrett returns home to Oahu, in order to find his father's killer. The governor offers him the chance to run his own task force . Steve's team is joined by Chin Ho Kelly, Danny "Danno" Williams, and Kono Kalakaua.
It has an average vote of 7.7 on TMDB.
3. NCIS
From murder and espionage to terrorism and stolen submarines, a team of special agents investigates any crime that has a shred of evidence connected to Navy and Marine Corps personnel, regardless of rank or position.
It has an average vote of 7.6 on TMDB.
4. Arrow
Spoiled billionaire playboy Oliver Queen is missing and presumed dead when his yacht is lost at sea. He returns five years later a changed man, determined to clean up the city as a hooded vigilante armed with a bow.
It has an average vote of 6.8 on TMDB.
5. Blue Bloods
A drama about a multi-generational family of cops dedicated to New York City law enforcement. Frank Reagan is the New York Police Commissioner and heads both the police force and the Reagan brood. He runs his department as diplomatically as he runs his family, even when dealing with the politics that plagued his unapologetically bold father, Henry, during his stint as Chief.
It has an average vote of 7.764 on TMDB.
6. Bull
Dr. Jason Bull is the brilliant, brash, and charming founder of a hugely successful trial consulting firm.
It has an average vote of 7 on TMDB.
7. Criminal Minds
An elite team of FBI profilers analyze the country's most twisted criminal minds, anticipating their next moves before they strike again. The Behavioral Analysis Unit's most experienced agent is David Rossi, a founding member of the BAU who returns to help the team solve new cases.
It has an average vote of 8.3 on TMDB.
8. Chicago P.D.
A riveting police drama about the men and women of the Chicago Police Department's District 21 who put it all on the line to serve and protect their community. District 21 is made up of two distinctly different groups: the uniformed cops who patrol the beat and go head-to-head with the city's street crimes and the Intelligence Unit that combats the city's major offenses - organized crime, drug trafficking, high profile murders and beyond.
It has an average vote of 8.4 on TMDB.
9. Scorpion
Based on a true story, Scorpion is a high-octane drama about eccentric genius Walter O’Brien and his team of brilliant misfits who comprise the last line of defense against complex, high-tech threats of the modern age. As Homeland Security’s new think tank, O’Brien’s “Scorpion” team includes Toby Curtis, an expert behaviorist who can read anyone; Happy Quinn, a mechanical prodigy; and Sylvester Dodd, a statistics guru.
It has an average vote of 8.239 on TMDB.
10. Empire
A powerful family drama about the head of a music empire whose three sons and ex-wife all battle for his throne.
It has an average vote of 7.2 on TMDB.
11. Quantico
A diverse group of recruits has arrived at the FBI Quantico Base for training. They are the best, the brightest and the most vetted, so it seems impossible that one of them is suspected of masterminding the biggest attack on New York City since 9/11.
It has an average vote of 6.5 on TMDB.
12. NCIS: Hawai'i
Jane Tennant, the first female Special Agent in Charge of NCIS Pearl Harbor, and her unwavering team of specialists balance duty to family and country while investigating high-stakes crimes involving military personnel, national security and the mysteries of the sun-drenched island paradise itself.
It has an average vote of 7.9 on TMDB.
13. 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 8.117 on TMDB.
14. The 100
100 years in the future, when the Earth has been abandoned due to radioactivity, the last surviving humans live on an ark orbiting the planet — but the ark won't last forever. So the repressive regime picks 100 expendable juvenile delinquents to send down to Earth to see if the planet is still habitable.
It has an average vote of 7.903 on TMDB.
15. Supernatural
When they were boys, Sam and Dean Winchester lost their mother to a mysterious and demonic supernatural force. Subsequently, their father raised them to be soldiers. He taught them about the paranormal evil that lives in the dark corners and on the back roads of America ... and he taught them how to kill it. Now, the Winchester brothers crisscross the country in their '67 Chevy Impala, battling every kind of supernatural threat they encounter along the way.
It has an average vote of 8.297 on TMDB.
16. Brooklyn Nine-Nine
A single-camera ensemble comedy following the lives of an eclectic group of detectives in a New York precinct, including one slacker who is forced to shape up when he gets a new boss.
It has an average vote of 8.2 on TMDB.
17. Downton Abbey
A chronicle of the lives of the aristocratic Crawley family and their servants in the post-Edwardian era—with great events in history having an effect on their lives and on the British social hierarchy.</p><p></p><p>
It has an average vote of 8.1 on TMDB.
18. CSI: Miami
CSI: Miami follows Crime Scene Investigators working for the Miami-Dade Police Department as they use physical evidence, similar to their Las Vegas counterparts, to solve grisly murders. The series mixes deduction, gritty subject matter, and character-driven drama in the same vein as the original series in the CSI franchise, except that the Miami CSIs are cops first, scientists second.
It has an average vote of 7.743 on TMDB.
19. Lethal Weapon
A slightly unhinged former Navy SEAL lands a job as a police officer in Los Angeles where he's partnered with a veteran detective trying to keep maintain a low stress level in his life.
It has an average vote of 7.3 on TMDB.
20. Marvel's Luke Cage
Given superstrength and durability by a sabotaged experiment, a wrongly accused man escapes prison to become a superhero for hire.
It has an average vote of 6.9 on TMDB.