Hidden Pyramids: Experts investigate ancient man's apparent obsession with building pyramids, and whether extra-terrestrials may have helped with their construction. (S7, ep 11)
Alien Breeders: Theorists ask whether a currently unidentified species represented in our DNA could be a result of breeding between humans and aliens in the remote past. (S6, ep 11)
Satan Conspiracy: New interpretations of ancient texts indicate that Satan may have been extraterrestrial. Could these new theories about the ruler of Hell be true? (S5, ep 11)
The Da Vinci Conspiracy: Experts scrutinise the paintings, journals and technical drawings of Leonardo Da Vinci. Could they hide evidence of extra-terrestrial beings? (S4, ep 11)
Aliens And America's Founding Fathers: Could the Founding Fathers have hidden secrets about ancient aliens in their documents, buildings and symbols? Experts investigate. (S3, ep 11)
Aliens And The Civil War: Experts examine the link between aliens and the Civil War, exploring Abraham Lincoln's strange visions and ghostly images seen at Gettysburg. (S7, ep 10)
Aliens And Insects: Could insects have descended from extraterrestrials? Experts investigate whether Earth's 10 quintillion critters could have dangerous links to aliens. (S10, ep 10)
Mysterious Relics: Experts investigate mysterious relics that have been revered by cultures for millennia. Could these sacred items truly hold divine or otherworldly power? (S5, ep 10)
Alien Power Plants: Ancient alien theorists ask whether the Greeks and Egyptians understood electricity. Could extraterrestrials have introduced them to such technology? (S4, ep 10)
Aliens And Evil Places: Experts investigate creepy places associated with death. Could otherworldly connections be responsible for strange disappearances and suicides?