Are we truly alone in the Universe? Ancient Astronaut theoristspropose that descriptions of sky gods and star beings mightreflect real encounters with extraterrestrial visitors in theremote past. Could this be true? Follow experts GiorgioTsoukalos, William Henry, and Jason Martell as they siftthrough the series archives of "Ancient Aliens" to uncoverin-depth descriptions and portrayals of these entities fromEgyptian, Sumerian, Chinese, Mesoamerican, and NativeAmerican traditions. Could the evidence reveal these beings tobe… ancient astronauts?