After the discovery of the city of Troy, archaeologists realise that some of the Greek stories are true! They then start to question if other Greek stories were true and if so were the stories of the Olympians also true? And if so, were they extraterrestrial beings that had come here to influence human kind? Ancient Aliens examines 75 million years of the most credible alien evidence here on Earth: from the age of the dinosaurs, to ancient Egypt, to the skies over the western desert in the present day US, ancient cave drawings of strange creatures, an asphalt-like substance in an Egyptian pyramid made from the remains of unidentified creatures, continued mass sightings in the USA.