UFO Relic: The team examines the most compelling examples of UFO relics available, like a unique and other-worldly piece of metal in Missouri. (S3, ep 6)

Arizona Lights: On 13 March, 1997, a string of fiery globes were seen over Arizona, but earlier that night some eyewitnesses saw something more shocking . (S2, ep 6)

Crash and Retrieval: The team head to Mexico to the site of an alleged international incident involving the remains of a UFO wreck. (S1, ep 6)

Underwater Alien Bases: The team investigates what appear to be underwater landing strips and other strange evidence in the wake of UFO sightings in Florida. (S3, ep 5)

The Real Roswell: The story of a UFO crashing in Roswell is the most famous case in UFO history. Now, a theory has emerged that there was more than one crash site. (S2, ep 5)

Abductions: This episode chronicles several close encounters with alien abductees who have been held captive, probed, examined and had objects implanted in their bodies. (S1, ep 5)

Nazi UFOs: Upon learning about a connection between the UFO phenomenon and the Third Reich, the team travel to Germany and Poland to investigate. (S3, ep 4)

First Contact: Experts investigate a reported crash of an alien craft in Texas in 1897, debris of which was allegedly thrown down a well and an alien body buried locally. (S2, ep 4)