Protomolecules

The Protomolecule is a fictional extraterrestrial biological agent featured in "The Expanse" science fiction series and its related media. It is an ancient, self-replicating, and transformative nanite-based substance discovered on the moon of Phoebe.

The primary characteristic of the Protomolecule is its ability to rewrite and control organic matter. When exposed to living organisms, it infiltrates their cells, takes over their biological processes, and mutates them into new, often monstrous forms. This transformation can lead to a complete restructuring of the host's body, creating beings with enhanced strength, new appendages, and a hive-mind connection to the Protomolecule itself.

The origins of the Protomolecule are unknown, but it is implied to be a weapon or a terraforming tool created by an advanced, extinct alien civilization known as the Builders. Their technology, including the Protomolecule, was designed to create life and potentially seed new worlds. However, the Protomolecule proved to be uncontrollable and ultimately led to the demise of its creators.

In "The Expanse," the Protomolecule becomes a central plot element, driving conflict and mystery. Various factions, including the United Nations, the Martian Congressional Republic, and the OPA, seek to control or weaponize it, while others strive to understand and contain its dangerous potential. The pursuit of knowledge and the struggle for power surrounding the Protomolecule have profound consequences for humanity and its future in the solar system.