What Caused the Apocalypse in The Eternaut’s Ending? Explained

Netflix’s The Eternaut isn’t a typical alien invasion story, and here’s its ending explained. The series builds tension slowly, keeping viewers guessing until the very end what the apocalypse is caused by.

Based on the classic Argentine comic by Hector German Oesterheld and Francisco Solano Lopez, the show starts with a sudden, unexplained catastrophe. Radioactive snow falls from the sky, wiping out most of humanity in an instant. Survivors are left scrambling, not just against the elements, but against something far more sinister lurking in the shadows.

The Eternaut’s ending and cause of apocalypse explained

The catastrophe begins with a sudden, lethal snowfall in Buenos Aires—a phenomenon that instantly kills anyone exposed without protective gear. At first, survivors assume it’s a chemical or nuclear attack, but the truth is far worse: an alien invasion.

The snowfall is just the first phase. Soon, giant insectoid creatures emerge, hunting humans and wrapping them in webs. Even more terrifying, some survivors begin acting strangely, hinting at mind control by an unseen force. The alien strategy happens in three calculated stages: first, altering Earth’s magnetic field to create the deadly snowfall, then deploying giant insectoid creatures to hunt survivors, and finally implementing a terrifying mind control system.

Several survivors begin exhibiting bizarre behavior that suggests something has hijacked their minds. Juan’s daughter, Clara, mysteriously reappears with no memory of her ordeal, despite evidence that she wore protective gear. His friend Lucas suddenly turns violent, attacking comrades before committing suicide while rambling about unseen forces.

Who is controlling the humans and giant bugs in The Eternaut?

The series builds to a terrifying revelation in The Enternaut ending. When Juan investigates a mysterious light emanating from a stadium, he witnesses crowds of people and the insectoid creatures, all standing motionless as if awaiting orders. Then the true architect of the apocalypse appears: a shadowy, multi-limbed alien entity that appears to be psychically controlling both humans and creatures alike.

Furthermore, Juan’s recurring visions hint at a deeper connection to the alien threat. His déjà vu moments imply he may be experiencing fractured memories of past (or future) events. Hinting at a non-linear timeline or a deeper psychic link to the invaders. As The Eternaut’s Season 1 ending withheld concrete answers, it sets up the arc for a more expansive Season 2.

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