Since its 2010 debut, the History channel’s hit series Ancient Aliens has kept viewers glued to the screen with the top 10 craziest examples of the so‑called ancient astronaut theory – the notion that old texts, myths and artifacts are proof that extraterrestrials once walked among our ancestors.
Why the Top 10 Craziest Theories Capture Imagination
10 Jonah Was Swallowed By An Alien Submarine
Fans of the ancient‑astronaut angle love to mine religious scriptures for clues, and the Bible offers a treasure trove. While many biblical stories may contain a grain of truth, the tale of Jonah being gulped down by a massive sea creature stands out as especially odd. Some scholars even argue it mirrors early Greek myths.
Ancient Aliens and its most vocal advocate, Giorgio Tsoukalos, argue that Jonah’s miraculous escape is genuine. Tsoukalos points out that in certain versions the whale’s “ribs” shine like polished bronze, and he concludes, “Jonah was, in fact, not swallowed by a whale… but by a U.S.O. – an unidentified submersible object.”
That, of course, assumes the whole episode ever happened.
9 Pakal’s Rocket
K’inich Janaab’ Pakal ruled the Maya city‑state of Palenque in the seventh century A.D. When he died, his body was placed within an ornate coffin and sealed inside the Temple of the Inscriptions.
Archaeologists who later opened the tomb praised the sarcophagus lid as a masterpiece of classic Maya art, noting that the familiar iconography made it straightforward to interpret the symbols and motifs.
Ancient‑astronaut enthusiasts, however, see the same lid as a smoking gun. Erich von Däniken claims the carving is “incredible… absolutely proof for extraterrestrials.” According to those theorists, the scene shows an astronaut climbing aboard a rocket, his hands on controls, his feet on pedals, a breathing tube around his neck, and exhaust streaming from the base of the craft.
The problem? Every element either corresponds to a well‑known Maya symbol or is a massive stretch. Would a civilization of visitors really employ technology as primitive as a rocket?
Bottom line: the image simply doesn’t look like a rocket, no matter how many alien fans try to convince you otherwise.
8 Hybrid Creatures Are The Result Of Genetic Testing
Mythical beasts have never been scarce. From the griffin (half lion, half eagle) to Medusa, whose hair was a tangle of venomous snakes, ancient cultures filled their stories with hybrids. Egyptian deities, for instance, often sported animal heads atop human bodies.
Some ancient‑astronaut proponents argue that these legends are evidence of alien genetic meddling. After all, modern humanity now toys with gene‑editing tools, so why not assume that visitors from elsewhere did the same millennia ago?
It’s an appealing idea, but it hinges on the assumption that these creatures truly existed. Even today we spin yarns about monsters like “Nessie” or Bigfoot—both of which some fringe theorists also attribute to extraterrestrials.
More likely, these hybrids spring from human imagination rather than laboratory experiments. Even if aliens could give Medusa snake‑like hair, they’d still need a plausible way to make her gaze turn onlookers to stone—something the ancient stories never explain.
In short, the genetic‑testing hypothesis stretches far beyond the evidence.
7 Teotihuacan Is A Computer… Or Something
Teotihuacan, the sprawling Toltec metropolis near present‑day Mexico City, is famed for its grand religious structures, most notably the massive Pyramid of the Sun.
Ancient‑astronaut circles claim the city’s overall plan resembles a giant computer circuit board, arguing that the layout “looks like one.” Various documentaries and articles from the community point to this alleged similarity.
What specifically looks like a circuit? Honestly, not much. Proponents also label certain temples as “processors,” yet they provide no solid rationale for that claim.
They do note that some structures incorporated electricity‑conducting mica, and a few underground chambers were entirely lined with the mineral. While intriguing, mica was a common building material in many ancient societies.
Overall, the circuit‑board analogy remains a tenuous stretch with little archaeological backing.
6 Sword In The Stone
The legend of a sword embedded in stone, famously linked to King Arthur, has echoes in other mythologies—think Thor’s hammer or countless other tales of magical weapons that only a divine figure can wield. Historians have struggled to find concrete proof that Arthur ever existed.
Ancient‑astronaut advocates, however, assert that the story isn’t just folklore—it’s a genuine account of alien technology. They suggest the “unmovable” blade was actually a high‑tech device, comparable to modern concept firearms that rely on biometric security.
Giorgio Tsoukalos even claims that Arthur’s famed Excalibur, along with Joan of Arc’s sword, were essentially “alien laser weapons,” wielded by humans who barely understood the underlying tech.
5 Dendera Light
Much like the Pakal carving, this theory begins with an image that supposedly depicts modern technology—in this case, something that looks strikingly like a light bulb.
The twist? The same relief also mirrors a classic Egyptian creation scene. In the Heliopolitan myth, the god Atum (a serpent) emerges from a lotus flower, creating the universe from a bubble of air in an endless dark ocean.
This mainstream interpretation fits perfectly: the bulb’s base resembles a lotus blossom, and the “filament” appears to be a serpent with a mouth and eyes, matching the ancient symbolism rather than any 20th‑century invention.
4 The Grim Reaper Was An Alien—And The Aliens Caused The Plague
During the Middle Ages, as the Black Death ravaged Europe, people sought explanations for the catastrophe. Demons, witches, and scapegoated groups like the Jews were blamed. While modern science pins the pandemic on fleas carrying Yersinia pestis, some alien‑theory writers, such as William Bramley, point the finger at extraterrestrials.
To rationalize how aliens might have infected humanity, these theorists invoke the ever‑popular chemtrail narrative—suggesting that invisible toxic fumes were sprayed over populations much like farmers treat crops, either for experimentation or some unknown purpose.
Others recount that victims of the plague experienced vivid hallucinations of a cloaked, hooded figure—later crystallized into the iconic Grim Reaper. Some accounts even claim witnesses saw such dark silhouettes roaming wheat fields just before a town’s outbreak.
If chemtrails aren’t the culprit, the alien hypothesis posits a more “personal” approach: extraterrestrials allegedly hovered in black cloaks, directly contaminating food supplies to accelerate the death toll.
3 Nazis Had Help From Extraterrestrials
In a classic episode of Ancient Aliens, the question is posed: Did Adolf Hitler’s quest for world domination rest on secret alien knowledge? The answer from mainstream historians is a resounding “no,” yet the UFO community remains fascinated by the Nazi‑UFO narrative.
It’s true that Nazi engineers produced groundbreaking rocketry, notably the V‑1 “flying bomb” and the V‑2 missile, which wreaked havoc across England and France during World War II.
According to the show, German rocket scientist Hermann Oberth claimed that such advanced technology could only exist because the Nazis were aided by “beings from another world.” This suggestion fuels the idea that extraterrestrials were whispering secrets into Nazi ears.
The term “foo fighter” entered the lexicon after Allied pilots reported strange aerial phenomena over German skies, further feeding the alien‑UFO connection.
Perhaps the most sensational claim involves the “Haunebu” project—a supposed fleet of saucer‑shaped craft. Proponents argue that German engineers reverse‑engineered an alien spacecraft that crashed in a Bavarian forest, using its technology to build the mysterious flying saucers.
2 Vimanas
One recurring motif in ancient‑astronaut circles is the depiction of extraterrestrials and their vehicles as god‑like beings riding heavenly chariots. The Indian epic Mahabharata introduces the concept of “vimanas,” described as flying palaces or thrones.
According to Ancient Aliens, these vimanas were actually alien spacecraft that ancient peoples mistakenly interpreted as divine chariots.
While a few descriptions of vimanas bear a passing resemblance to metallic saucers, the majority portray them as human‑shaped chariots drawn by flying horses, far removed from the classic UFO image.
1 Aliens Killed The Dinosaurs
Among the most perplexing claims on Ancient Aliens is the idea that benevolent extraterrestrials intervened in a prehistoric showdown between early humans and dinosaurs, ultimately wiping out the reptiles to make way for humanity.
The episode depicts UFOs hunting down herds of T. rex with laser weapons. An alternate version suggests that aliens simply re‑engineered dinosaurs, shrinking and taming them to coexist peacefully with early humans.
When pressed for proof, the show leans heavily on creationist sources, arguing that carbon‑dating is flawed, that fossils sometimes show both dinosaur and human footprints together, and that ancient artwork allegedly portrays humans alongside dinosaurs.
All of these pieces of evidence have been thoroughly debunked by mainstream scientists, leaving the alien‑dinosaur extermination theory firmly in the realm of speculative fiction.