"The Prototypes" argues that Earth may have served as an extraterrestrial laboratory where multiple intelligent human-like species were deliberately created as experimental prototypes. The episode points to discoveries like Homo naledi in South Africa's Rising Star Cave—a species with a puzzling mix of primitive and advanced traits—as evidence that different hominid species appeared suddenly in isolated regions rather than evolving gradually from a common ancestor. Ancient astronaut theorists, citing the work of researcher David Jacobs on alleged modern alien abductions involving genetic procedures, suggest that extraterrestrials have been manipulating human DNA for millennia, creating various hominid "prototypes" before selecting Homo sapiens as the sole survivor. The episode invokes the "Lord of the Rings" scenario where Neanderthals, Denisovans, and other species coexisted, questioning why fossil evidence doesn't show a slow, steady progression as evolution would predict.
Mainstream paleoanthropology actually has well-documented explanations for these phenomena: evolution doesn't proceed at a constant rate, and isolated populations can develop distinct characteristics relatively quickly through processes like genetic drift and adaptive radiation. Scientists like William Leonard acknowledge uncertainties about why other hominid species went extinct, but attribute it to climate change, competition for resources, and interbreeding rather than extraterrestrial selection. The episode remains compelling because discoveries like Homo naledi genuinely surprised researchers with unexpected trait combinations, and the fossil record does contain gaps that scientists are actively working to fill—making the underlying mysteries real even if the proposed explanations stretch beyond current evidence.
Criel Mound, Kanawha Valley
United States · Fort Ancient / Adena
Theorists argue that oversized skeletal remains measuring up to seven or eight feet tall, excavated from Adena burial mounds in the Kanawha Valley of West Virginia by the Smithsonian in the 1800s, are evidence of a giant race connected to the biblical Nephilim and possibly to extraterrestrial DNA. Mainstream archaeology attributes the large skeletal measurements to natural human size variation within the Adena culture, and critics note the Smithsonian has no record of suppressing such finds.
Denisova Cave, Altai Mountains
Russia · Cro-Magnon / Upper Paleolithic
Ancient astronaut theorists argue that the Denisovans' geographic isolation in the remote Altai Mountains supports the idea that extraterrestrials used separated environments as distinct experimental incubation sites for different human prototypes. Mainstream scientists identify the Denisovans as a distinct archaic human population based on ancient DNA extracted from a finger bone and tooth, noting genetic evidence of interbreeding with both Neanderthals and modern humans.
Liang Bua Cave, Flores
Indonesia · Hypothetical Extraterrestrial
Theorists argue the discovery of Homo floresiensis on the isolated island of Flores suggests the island served as an extraterrestrial petri dish for a separate human prototype experiment, pointing to the species' inexplicably tiny body and brain size alongside modern-human-like tools. Mainstream scientists attribute Homo floresiensis to island dwarfism and geographic isolation, noting its stone tools are consistent with anatomically modern human technology despite the small brain size.
Pyrenees Mountains (Basque Region)
Spain / France · Modern
Ancient astronaut theorists point to the Basque people's linguistic isolation and the world's highest concentration of Rh-negative blood type as evidence of a separate, possibly extraterrestrial-influenced genetic lineage distinct from all other human populations. Mainstream anthropologists and geneticists attribute the Basque population's unique language and blood-type frequencies to prolonged geographic and cultural isolation in the Pyrenees, not to any non-human origin.
Rising Star Cave (Dinaledi Chamber)
South Africa · Cro-Magnon / Upper Paleolithic
Ancient astronaut theorists cite the Homo naledi discovery as evidence of separately engineered human prototypes, noting the species' paradoxical mix of primitive and advanced traits as inconsistent with gradual evolution. Mainstream paleoanthropologists classify Homo naledi as a previously unknown hominin species whose distinctive morphology and apparent ritual burial behavior expand understanding of human evolutionary diversity.
Sima de las Palomas
Spain · Cro-Magnon / Upper Paleolithic
The episode presents the ritualistic burial of Neanderthals at Sima de las Palomas as evidence that Neanderthals possessed complex religious thinking and were far more cognitively advanced than previously assumed, which theorists use to argue their extinction was a deliberate extraterrestrial termination rather than natural die-off. Mainstream archaeologists interpret the folded-arm burials as evidence of Neanderthal symbolic reasoning and proto-culture, contributing to the broader reassessment of Neanderthal cognitive capabilities.