Emperors Kings And Pharoahs: Could ancient rulers have had otherworldly links? Experts examine whether history's most powerful leaders were 'chosen' and guided by aliens. (S5, ep 8)

Einstein Factor: Ancient astronaut experts believe the minds of Einstein and Galileo were superhuman. Could these historical geniuses have had extraterrestrial connections? (S4, ep 8)

Aliens And Lost Worlds: Experts search for proof of alien visitors in the ruins of lost civilisations. Could Mayan carvings reveal a city once ruled by otherworldly beings? (S3, ep 8)

Angels And Aliens: Biblical texts describe winged creatures carrying messages from the heavens. But are angels merely the product of the imagination - or do they really exist? (S2, ep 8)

Creatures Of The Deep: Experts investigate whether alien life forms are thriving in our seas, following Russian cosmonauts' discovery of living plankton in space. (S8, ep 7)

Alien Messages: Could extraterrestrials have left us clues to the universe's mysteries? Experts investigate cryptic puzzles that might have been left by ancient aliens. (S7, ep 7)

Treasures Of The Gods: Across the world, there are stories of treasures that have been lost for centuries. Could these ancient relics have been hidden by extraterrestrials? (S6, ep 7)

Von Daniken Legacy: A look at the controversial ancient alien theories of Erich von Däniken, whose books have sold over 65 million copies worldwide. (S5, ep 7)

Aliens And Bigfoot: Ancient astronaut theorists hunt for evidence linking Bigfoot to alien species from the distant past. Could the ape-like giant be an extraterrestrial? (S4, ep 7)

Aliens, Plagues And Epidemics: Experts investigate reports of strange bronze flying ships spotted during the Black Death. Could aliens have brought deadly disease to Earth? (S3, ep 7)