Series Five of "Ancient Aliens" on History continues to explore the fascinating field of alien research. Did intelligent aliens roam the Earth thousands of years ago? Could they have come from the Orion Nebula? Were monumental structures like the pyramids created to worship or guide them, and did they help humans develop other advanced technologies like power plants? Researchers explore evidence of mysterious ancient phenomena, such as alien abductions documented in the Hebrew Bible, Egyptian hieroglyphs depicting the use of light bulbs, miles-long cryptic markings in Peru and more. We explore whether ancient leaders, usually attributed with divine powers, were actually connected to extraterrestrial forces. Archaeologists ponder the healing power of ancient objects like sacred and luminous, skullshaped crystals. Do these controversial artefacts hold the secrets to the universe? From artefacts to firsthand accounts, this compelling inquiry presents grounded, historical depth while challenging our understanding of ancient civilizations.