The Silencers: UFOs are the biggest mystery of our time and somebody - or something - seems determined to keep it that way. (S3, ep 9)

Underwater Area 51: The team investigate the highly secretive underwater testing facility AUTEC, said to be used by the US Navy for weapons testing and underwater research. (S3, ep 8)

Alien Harvest: The team investigate eyewitness reports of cattle slaughter allegedly caused by UFOs, and are hot on the trail of a recent mutilation case. (S3, ep 7)

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)

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)

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)

The Bathtub Killer: A look at the tense search for Bathtub Killer Dale Devon Scheanette, who was executed in 2009 for murdering two women in Arlington, Texas. (S3, ep 13)

Random Acts Of Madness: Years after a father is shot after a night of revelry, an unrelated cold case and a person's guilty conscience finally brings his killer to justice. (S3, ep 12)

Deadly Denial. When a gun advocate is murdered in her home, detectives suspect the victim knew her attacker. Can forensic evidence point them to the killer? (S3, ep 11)

Hotel Homicides: In the 1990s, three woman were killed in three Iowa hotels. In the infancy of forensic testing, how did detectives bring their sadistic murderer to justice? (S3, ep 10)