本節目要探討一個飽受爭議的理論，就是外星人數百萬年來都在造訪地球。從恐龍時期到古埃及，從早期的洞穴壁畫到持續有美國民眾目擊，在這部熱門的歷史頻道節目系列中，每集的內容都會針對問題、推測、啟發性的爭論、第一手報導，和有關這個古老辯論的基礎理論，深入研究歷史性的意義。難道外太空的外星人，在幾千年前就造訪過地球？
"Ancient Aliens" explores the controversial theory that extraterrestrials have visited Earth for millions of years. From the age of the dinosaurs to ancient Egypt, from early cave drawings to continued mass sightings in the US, each episode in this hit HISTORY series gives historic depth to the questions, speculations, provocative controversies, first-hand accounts and grounded theories surrounding this age old debate. Did intelligent beings from outer space visit Earth thousands of years ago?
