A UFO sighting in Phoenix leads Chuck and the team to Sedona, Ariz., where these kinds of incidents occur on a nightly basis; they investigate whether the area's powerful energy vortexes are acting as portals for otherworldly visitors.

Chuck and the team investigate UFO sightings in and out of the water off the coast of southern California; they probe the connection between UFOs, the military and the ocean itself.

A Missouri man who claims UFOs are stalking him reaches out to Chuck and the team for help; during the intense investigation, they uncover a dark secret which may explain why their client is experiencing so much UFO activity.

Mysterious animal deaths and UFO sightings bring Chuck to Colorado to search for an explanation; reports of the incidents are going unanswered by authorities, leading him to wonder if it's a government cover-up.

After an informant relays a story about an alien that reportedly escaped from Area 51, Chuck and the team head to Tonopah, Nev., to investigate whether this creature still roams the area.

Chuck receives a map from an informant leading to an alleged cache of recovered materials from the Roswell incident; he and his team go on the treasure hunt of lifetime to locate what could be the mother lode of all UFO discoveries.

Chuck and the team investigate the recent sighting of a possible shape-shifter near Utah's Skinwalker Ranch.

A rash of recent UFO sightings brings Chuck and the team to Missouri, the home of the 1973 Piedmont lights incident; armed with new evidence, they tackle the question of whether history is repeating itself.