Another season of alien intervention belongs to History. Ancient Aliens continues to examine 75 million years of the most credible alien evidence here on Earth. Season 4 explores new directions, including sightings and phenomena from ancient times to the present. From the age of dinosaurs to ancient Egypt, from early cave drawings to continued mass sightings in the U.S., each two-hour episode gives historic depth to the questions, speculations, controversies, firsthand accounts and grounded theories surrounding an age-old debate. Did intelligent life forms from outer space visit Earth thousands of years ago? Do they visit us now? History ignites the inquiry while exploring possible connections between UFO phenomena and information decoded from ancient texts and artifacts.