Watch Ancient Aliens | History Vault 22 SEASONS AVAILABLE (279 Episodes)Discover the controversial theory that aliens have visited Earth for millions of years, from the age of the dinosaurs, to ancient Egypt, to the present-day U.S. Watch it free for 7 days. Commercial-Free. Cancel Anytime. Start free trial to watch Browse episodes × HISTORY Channel brings you thousands of documentaries and series exploring the events and people that shaped our world, from ancient empires to modern warfare. Stream now commercial-free. Cancel anytime. Start free trial to watch History Vault Brings You Thousands of Documentaries & Series Learn more Available on: