远古外星人第四季

01末日预言The Doomsday Prophecies 02玛雅人的阴谋The Mayan Conspiracy 03小灰人The Greys 04外星人与大灾变Aliens and Mega-Disasters 05与美国太空总署的联系The NASA Connection 06普马彭古的秘密The Mystery of Puma Punku 07外星人和大脚怪Aliens and Bigfoot 08达芬奇阴谋The Da Vinci Conspiracy 09时间旅行者The Time Travelers 10外星人和恐龙Aliens and Dinosaurs