This episode investigates whether 20th-century incidents like the 1942 Battle of Los Angeles, mysterious "foo fighters" observed by WWII pilots, and the 1947 Roswell crash represent evidence of extraterrestrial contact—and asks what would happen if aliens returned today. Ancient Astronaut theorists point to ancient Sanskrit texts describing 400,000 human-like species across the cosmos as evidence that our ancestors documented alien civilizations, suggesting these visitors might one day come back. The episode explores how humanity has shifted from passive observation to active search through initiatives like SETI, founded in 1961 by astronomer Frank Drake, who created the Drake Equation to calculate the probability of intelligent life existing elsewhere in the universe.
Mainstream astronomers acknowledge the Drake Equation as a useful framework for discussing variables like habitable planets and the emergence of life, though they emphasize it's based on largely unknown factors—particularly the lifespan of technological civilizations. The 1942 Los Angeles incident is typically attributed to wartime jitters and anti-aircraft fire aimed at weather balloons or false radar returns, while "foo fighters" are often explained as ball lightning, St. Elmo's fire, or optical illusions. What makes this episode compelling is its exploration of legitimate scientific efforts like SETI's radio telescope searches, which represent genuine attempts to detect extraterrestrial signals using sound astronomical principles, even if the connection to ancient texts remains speculative.
Battle of Los Angeles Site
United States · Modern
Ancient Aliens claims that in 1942, the Battle of Los Angeles involved the US military and Air Defense allegedly fighting a UFO, presenting this as 20th century evidence of alien contact.
Cleveland, Ohio (Lake Erie UFO sightings)
United States · Modern
The episode presents the March 2010 Cleveland sightings, in which a pulsating, color-changing light hovered over Lake Erie for 11 consecutive nights and was filmed by witnesses, as an example of a credible, repeated modern UFO event that defies easy dismissal. No official government investigation or definitive mainstream explanation for these specific sightings is noted in the episode.
Germany / Western Europe (Foo Fighters theater)
Germany · Modern
Theorists argue that the glowing balls of light dubbed 'Foo Fighters' reported by Allied bomber crews over Germany and Western Europe during World War II were either extraterrestrial craft or Nazi reverse-engineered alien technology, pointing to reports of engine failures when the objects appeared and pilots flying through them as if they had no mass. Mainstream historians have attributed Foo Fighters to a variety of explanations including St. Elmo's fire, experimental German aircraft, and combat stress.
Green Bank, West Virginia (Drake's Radio Telescope Site)
United States · Modern
Theorists cite Frank Drake's 1960 radio telescope experiment in West Virginia as the birth of humanity's organized attempt to detect extraterrestrial signals, framing it as evidence of the scientific community's implicit acknowledgment that alien intelligence exists. Mainstream science presents it as the origin of radio astronomy and the SETI program, a pioneering but inconclusive search for artificial signals from nearby stars.
Moss Landing Wildlife Area, California (NASA microbial mat research site)
United States · Modern
NASA scientists study microbial mats at Moss Landing as analog environments for understanding how life affects a planet's atmosphere, providing biosignature detection methods that could be used to identify life on exoplanets. The episode presents this research as part of humanity's broader scientific effort to confirm that life — and potentially intelligent life — exists elsewhere in the universe.
Ohio State University Radio Observatory (Big Ear)
United States · Modern
Theorists highlight the 1977 'Wow! signal' detected at Ohio State as potential evidence of an extraterrestrial transmission, noting it came from the direction of Sagittarius and has never been explained or repeated. Mainstream scientists acknowledge the anomalous 72-second signal but note it has never been confirmed and could have a natural or terrestrial origin.
RAF Cosford and RAF Shawbury, United Kingdom (Cosford Incident)
United Kingdom · Modern
Theorists, via Nick Pope's testimony, describe a vast triangular craft that overflew two British air force bases on March 30, 1993, witnessed by multiple police and military personnel and described as the size of a jumbo jet capable of instantaneous acceleration to far beyond military jet speeds, as evidence of non-human technology visiting Earth. Pope investigated the case for the Ministry of Defence, which was unable to provide a conventional explanation for all the reported sightings.