The Nature of Things (1960- )

90 Day Fiancé offers a unique look into the world of international dating and matrimony. Using a unique 90-day fiance visa, the K-1 visa, four women and two men will travel to the U.S. to live with their overseas partners for the first time. The couples must marry before their visas expire in 90 days, or the visiting partner will have to return home. They'll have to overcome language barriers, culture shock and skeptical friends and family -- all with a clock that starts ticking the moment they step foot on U.S. soil. The stakes are incredibly high as these couples are forced to make a life-altering decision: get married or send their international mate home.

No job is more stressful, dangerous or exhilarating than those of the Firefighters, Rescue Squad and Paramedics of Chicago Firehouse 51. These are the courageous men and women who forge headfirst into danger when everyone else is running the other way and whose actions make the difference between life and death. These are their stories.

District 21 of the Chicago Police Department is made up of two distinctly different groups. There are the uniformed cops who patrol the beat and go head to head with the city's street crimes. And there's the Intelligence Unit, the team that combats the city's major offenses - organized crime, drug trafficking, high profile murders and beyond. These are their stories.

Shemar Moore stars as a locally born and raised S.W.A.T. sergeant newly tasked to run a specialized tactical unit that is the last stop in law enforcement in Los Angeles. Torn between loyalty to where he was raised and allegiance to his brothers in blue, former Marine Daniel "Hondo" Harrelson has everything it takes to be an excellent leader and bridge the divide between his two worlds.

NCIS (Naval Criminal Investigative Service) is more than just an action drama. With liberal doses of humor, it's a show that focuses on the sometimes complex and always amusing dynamics of a team forced to work together in high-stress situations. Leroy Jethro Gibbs, a former Marine gunnery sergeant, whose skills as an investigator are unmatched, leads this troupe of colorful personalities. Rounding out the team are Anthony DiNozzo, an ex-homicide detective whose instincts in the field are unparalleled and whose quick wit and humorous take on life make him a team favorite; the youthful and energetic forensic specialist Abby Sciuto, a talented scientist whose sharp mind matches her Goth style and eclectic tastes; Caitlin Todd, an ex-Secret Service Agent; and Timothy McGee, an MIT graduate whose brilliance with computers far overshadows his insecurities in the field; Assisting the team is medical examiner Dr. Donald "Ducky" Mallard, who knows it all because he's seen it all, and he's not afraid to let you know. From murder and espionage to terrorism and stolen submarines, these special agents travel the globe to investigate all crimes with Navy or Marine Corps ties.