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Investigators circle the globe in search of evidence in their quest to determine whether life on Earth began in outer space and if aliens influenced mankind in ancient times. Did extraterrestrial beings visit Earth and share information about technology and influence human religions? And more importantly, if aliens visited the planet before, will they return? Alien theorists believe that the answer to both questions is a resounding yes.
Ancient Astronaut theorists suggest that aliens may have colonised an ice-free Antarctica, before a global event plunged it into the Ice Age. (S9, ep 2)
As we look forward to the first astronauts reaching Mars in the next 20 years, is there evidence to suggest human life was first seeded there? (S9, ep 5)
As science turns towards augmenting humanity with technology, theorists suggest that we are merely following the path of our alien creators. (S9, ep 7)
Specialists in the field of the extraterrestrial examine new evidence that suggests there was extraterrestrial intervention on Earth in the distant past. (S9, ep 1)
Ancient Astronaut theorists suggest that aliens have been guiding mankind in secret to bring about huge leaps in technological advancement. (S9, ep 6)
Ancient Astronaut theorists examine the creation myth of "The Cosmic Egg", and look at why the concept is so pervasive throughout the world. (S9, ep 4)
Ancient Astronaut theorists look at the Aborigine legend of Dreamtime, and ask if these stories hold the proof that aliens created life on Earth. (S9, ep 8)
Could claims of "The Nine" - a federation of extraterrestrial beings who monitor and influence mankind - have any credence? Experts believe so. (S9, ep 9)
Ancient Astronaut theorists suggest that China, with its history of technological advancement and isolationism, could have been the home of alien beings. (S9, ep 10)
Through history, mankind has credited its existence to otherworldly beings. Could this be true? Can any proof be found in these early beliefs? (S9, ep 3)
It was mankind's finest hour, the greatest technological achievement of the 20th century - the Apollo 11 mission to the Moon. (S9, ep 11)
Russia spans over six million square miles of some of the most rugged terrain on Earth, much of which is uninhabited and largely unexplored. (S9, ep 12)
The US military has denied that the 1947 Roswell crash was anything other than a weather balloon, but FBI files include a memo that indicate otherwise. (S9, ep 13)
Thousands of people from every part of the world have reported being abducted by aliens, including even a world leader - President Kiran Ilyumzhinov. (S9, ep 15)
Of all the Hindu gods, none is more important than Shiva, the great destroyer. Could the deity have been the leader of an extraterrestrial race? (S9, ep 16)