Season 4: Could natural disasters really be the work of extraterrestrial forces? In 2011, after a 30- foot tsunami ravaged Tohoku, Japan, the local media reported more than 1000 UFO sightings over the inundated shoreline. Did other worldly beings that descended from the sky have anything to do with the abrupt disappearance of the Mayan's? Does the Mayan Long Count Calendar, in which the world ends on December 21,2012, give credence to Doomsday Prophecies? Are Grey Aliens Real? Many have claimed to have been visited and even abducted by them. Is NASA Sharing all that it knows about the universe? Or are they protecting us from the truth? Ancient Aliens season 4 continues to examine 25000 years of the most credible alien evidence here on Earth. ANCIENT ALIENS SEASON 4 includes ten mystirying episodes of the hit series in stunning high definition.