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?

Ancient Aliens: Declassified is a series that airs extended enhanced episodes with extra information, deleted scenes and bonus unseen footage from the show "Ancient Aliens" that also airs on the History Channel.

Across America, there are more UFO sightings than ever before. 6 million Americans believe they've had an actual physical encounter with an extra-terrestrial. What lies behind this increasing number of reports? Are these UFO's actually extra-terrestrial craft? And do our government know more than they are letting on? A team of four professional UFO investigators has come together to investigate the phenomena. They are travelling across America in attempt to hunt down the truth.

Where do flying saucers originate? Do they carry aliens from other worlds? Or is the truth actually a lot stranger. During World War II the Nazi's employed scientists to re-imagine the boundaries of scientific thought and practice. Many in the field of advanced weapon design - the programme that produced the V1 and V2 rockets that rained on Britain. But did this same unit produce rudimentary flying saucers? Declassified military documents detail the numerous reports by allied pilots of 'foo fighters', unusual craft with incredible acceleration engaging them in the skies above Germany.

Abductions, invasions, and conspiracies about aliens surround our world every day, from nightly news to video games to the latest box office hit. Delving into the "photoshopping" of space, the value of Wikileaks, and the role social media plays in alien stories, Unsealed: Alien Files offers a unique 360 degree look at how alien interaction may have affected our past, and how it will affect our future.

There is a place where the truth about UFOs exists; a vast archive of over 70,000 files gathered over nearly half a century. The place is called Hangar 1. Now, it is finally open for investigation. MUFON, an independent organization dedicated to investigating UFOs, has worked diligently to compile, research and store these files. The History series Hangar 1: The UFO Files will delve deep into these archives to look for connections, clues and evidence; because only by investigating the files of Hangar 1 can we find the truth about UFOs.

UFOs Declassified uncovers the world's most amazing UFO stories and reveals the top secret documents that back them up!

Discovery's Alien Mysteries is a fantastically creative and imaginative new take on some of the most enduring UFO mysteries from the last 50 years. Each story is backed up by credible witnesses, investigative reports, and tangible evidence such as physical markings, photographs, radar reports, and videos.

The series will reveal newly authenticated evidence and footage, interviews from eyewitnesses and former military personnel who have never spoken out before, and extensive breakthroughs in understanding the technology behind these unknown phenomena in our skies.

In UFOs: The Lost Evidence, current and former government officials, pilots and astronauts come forth to share evidence of humanity's contact with the extraterrestrial.

From the dawn of mankind, they have been here guiding us, monitoring us, perhaps helping us with our advancement, but also manipulating us to some kind of end game. No, we are not alone and never were. From the true stories of credible eyewitnesses, learn fascinating insight into the Alien Presence on Earth and what it may mean for mankind.