S15 E1: The Mystery of Nan Madol

S15 E2: The Relics of Roswell

S15 E3: Destination Chile

S15 E4: The Real Men in Black

S15 E5: The Mystery of the Stone Giants

S15 E6: The World Before Time

S15 E7: They Came from The Pleiades

S15 E8: The Immortality Machine

S15 E9: The Shapeshifters

S15 E10: The Mystery of Skinwalker Ranch

S15 E11: The Ultimate Guide to UFOs

S15 E12: Aliens and the Presidents