Throughout human history, there have been sudden and dramatic leaps in our evolution that simply cannot be explained by Darwinian theory. Ancient Astronaut theorists propose that the “missing link” is extraterrestrial intervention. The evidence may be found in our proto-human past, the key moments in our development, and the extraordinary changes witnessed in new generations being born. Could humanity be overdue for the next upgrade? And if so, what might be in store for the human race?

Ancient Astronaut theorists have long proposed that Earth is an extraterrestrial laboratory. If so, does it extend beyond humans into the animal kingdom? Accounts of animalist gods can be found across the globe, including insectoid and reptilian deities that curiously mirror modern alien encounters. Might this point to a direct extraterrestrial tie to the strange creatures on our planet, from Bigfoot and Mothman--to the evolutionary oddities that defy natural development on Earth.

Across nearly every continent on Earth we can find similar remarkable stone structures of unexplainable engineering feats. Might the building of these megalithic sites have been directed by an extraterrestrial hand, as Ancient Astronaut theorists have long proposed? From the curious discoveries made at the Great Pyramid, at Teotihuacan and Stone Henge, new evidence may suggest that these structures are not only connected, but also part of a more profound--and powerful--network.

Humans are just scratching the surface when it comes to what we know about our ancestors from the distant past. Lost cities, ancient texts, mysterious carvings, and unexplained structures provide clues to a long-forgotten time that goes further back in history than we could have ever imagined. From Egypt to China and even Antarctica, Ancient Astronaut theorists propose that the deeper we dig, the closer we will come to proving an extraterrestrial influence on Earth's ancient inhabitants.

Thousands of UFO sightings are reported in the United States every year, and intriguingly many of them center around U.S. military operations. Might extraterrestrials have a special interest in the country's warfare capabilities? Recently, the United States government has officially acknowledged that it is investigating unidentified aerial phenomena. What secrets have been kept from the public--and even some U.S. Presidents? And what role does the public play in demanding answers to our questions about extraterrestrials?