远古外星人第四季  

01末日预言The Doomsday Prophecies02玛雅人的阴谋The Mayan Conspiracy03小灰人The Greys04外星人与大灾变Aliens and Mega-Disasters05与美国太空总署的联系The NASA Connection06普马彭古的秘密The Mystery of Puma Punku07外星人和大脚怪Aliens and Bigfoot08达芬奇阴谋The Da Vinci Conspiracy09时间旅行者The Time Travelers10外星人和恐龙Aliens and Dinosaurs