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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.

When the mysterious deep space research vessel USCSS Maginot crash-lands on Earth, Wendy and a ragtag group of tactical soldiers make a fateful discovery that puts them face-to-face with the planet's greatest threat.

The Wall is packed with drama and action, this is a game that the entire family can root for together. Executive producer LeBron James presents a challenge infused with the thrill of victory and the agony of defeat, where regular people can achieve their dreams with one bounce of the ball. Hosted by comedian Chris Hardwick and set in a large glossy arena centering on the colossal 40-foot wall, the gameplay involves quick thinking, shrewd strategy and a little luck. Played by contestant pairs, this is an unpredictable journey with giant swings of fortune and millions of dollars passing through the contestants' hands throughout the hour.

In a ruined and toxic future, thousands live in a giant silo deep underground. After its sheriff breaks a cardinal rule and residents die mysteriously, engineer Juliette starts to uncover shocking secrets and the truth about the silo.

Ancient Aliens explores the controversial theory that extraterrestrials have visited Earth for millions of years. From the age of the dinosaurs to ancient Egypt, from early cave drawings to continued mass sightings in the US, each episode in this hit History series gives historic depth to the questions, speculations, provocative controversies, first-hand accounts and grounded theories surrounding this age old debate. Did intelligent beings from outer space visit Earth thousands of years ago?