On August 21st, 2004, people driving home from an Ozzy Osbourne concert in Tinley Park, Illinois, reported seeing a large triangular UFO with three bright red lights. Two months later, on Halloween night, hundreds of eyewitnesses reported seeing a similar UFO. By the time the lights returned again the following year, the mountain of evidence was overwhelming--videos, eyewitnesses, and news coverage were everywhere. The team tackles this incredible contemporary UFO case, and searches for what's responsible for the mass sightings in a small Chicago suburb.

During the year 1994, numerous residents of both Michigan and Ohio made calls to 911 reporting UFO sightings. Local police responding to these calls remarked that they were pursuing objects that were out of this world. A radar operator working that night in 1994 for the National Weather Service claimed that his radar picked up unidentified objects. On January 5, 2000, a truck driver in Highland, Illinois reported seeing an enormous object that is later tracked by five different witnesses across four towns. Listen to the actual tapes of conversations between police and dispatchers as police report seeing UFOs and examine how the authorities react when UFO emergencies grip the public.

Late in the evening of April 16th, 2008, the tiny town of Kokomo, Indiana was rocked by an ear-piercing, high decibel boom. Houses shook. Thousands of panicked citizens called 911. Police, firefighters and Homeland Security showed up to investigate. Witnesses claimed to see strange orange balls of light in the sky attached to something they couldn't identify. Just months earlier, in nearby Denver, Indiana, a terrified mother and son filmed lights they'd never seen before. The team heads to the heartland to unravel the clues behind the strange booms and menacing lights over the skies of Indiana, one of the most current UFO sightings in America.

On April 19, 1897, the Dallas Morning News reported a mysterious airship had crashed into a windmill in the nearby town of Aurora, Texas. Townspeople were said to have found an alien body and buried it in the local graveyard; the crash debris was dumped into a local well. More than 40 years later, the ranch owners were reporting skin lesions and crippling rheumatoid arthritis, which they attributed to tainted well water. The well was sealed over and forgotten. Now, more than a century after the event, the team will reopen the well, and search for the legendary grave, as they attempt to solve one of the earliest UFO cases ever recorded.

On July 8, 1947 at 5:26 EDT, an Associated Press news wire announced that soldiers from Roswell Army Air Field in New Mexico recovered a flying disk from a nearby rancher's property. The tiny town of Roswell has never been the same. Now, 61 years later, new theories, new witnesses, and new evidence have emerged. The most shocking lead is that there may have been a second crash, and if it can be found, it may finally reveal what really happened at Roswell.

On April 21st, 2008, one of the most talked-about incidents in modern UFO history opened a new chapter - the Phoenix Lights.

In the early 1950's, James McDonald, a senior physicist at the University of Arizona, changed the entire course of UFO research. For nearly 20 years he examined UFO reports in great detail - interviewing over 500 witnesses, uncovering important government documents, and testifying before Congress in 1968. He challenged skeptics, performed scientific analysis, and led the charge for UFOs to be properly studied. After his tragic death in 1971, his investigations and files were sent to the University archives, where they lay dormant...until now. The team brings these lost UFO files back into the public eye for the first time on television, and looks at evidence long thought lost to history.

On December 29, 1980, Betty Cash, Vickie Landrum and Colby Landrum took a drive that would soon become a life-changing nightmare. At approximately 9PM, driving through the Piney Woods of Texas, they observed a huge diamond-shaped object flying low above the isolated road, expelling flame and emitting significant heat. That night, all three experienced horrible physical symptoms--nausea, vomiting, diarrhea, weakness, and burning sensations all over their bodies. Betty Cash's symptoms soon worsened, and a few days later, she was sent to the emergency room, unable to walk, and losing large patches of skin and clumps of hair. The team re-opens this and other famous cases of alleged alien effects to determine if UFOs are leaving behind more than just sightings.

In May of 2008, the UK's Ministry of Defense made decades' worth of classified files on UFOs freely available to the public. One month later, UFO hysteria ripped through the country. In June, a police helicopter crew spotted unusual aircraft in Wales. South Wales Police confirmed the sighting and reported it to the Ministry of Defense. Numerous witnesses and videos poured into Britain's top newspapers of more sightings - UFO madness had come to the UK. Former MOD investigator Nick Pope joins the team in solving the most exciting and recent UFO sightings in the world.

IOn January 28th 1994, an Air France pilot, his crew and passengers witnessed a brightly-glowing red and brown disc-shaped object while flying to London. Estimates of the disc's size were between 800 and 1,000 feet long...more than 3 times the size of a 747. On April 25th 2007, the captain of a passenger plane crossing the English Channel observed two bright-yellow flat objects for more than 15 minutes. He is astounded by their size - which he claims could have been as much as a mile wide. A pilot from a separate aircraft corroborated the story. The team takes to the skies to probe some of the largest UFO sightings ever recorded.

There are approximately 30,000 commercial flights in the United States every day, and as the number of flights increase, so does the proximity of UFO encounters.

In the early morning hours of May 14, 2008, witnesses in Needles, CA saw a turquoise glowing object in a rapid descent over the Colorado River.

On October 26, 1994, the U.S. government made their first official acknowledgement of Area 51. Six months later, nearly 4,000 acres of previously public land surrounding the base were closed.