Top 20 Countdown: Most Shocking - Season 2

Reacher follows Jack Reacher, a veteran military police investigator who 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. When Reacher arrives in the small town of Margrave, Georgia, he finds a community grappling with its first homicide in 20 years. The cops immediately arrest him and eyewitnesses claim to place Reacher at the scene of the crime. While he works to prove his innocence, a deep-seated conspiracy begins to emerge, one that will require Reacher's keen mind and hard-hitting fists to deal with. One thing above all is for sure: They picked the wrong guy to take the fall.

In Aussie Gold Hunters, we join three hard-core crews of gold prospectors as they take the gamble of a lifetime and battle to strike it big, deep in the wild west of outback Australia.

An emotional thrill ride through the day-to-day chaos of the city's newest state-of-the-art trauma center and into the lives of the courageous doctors, nurses and staff who hold it all together. This is one of those days.

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.

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.