Where Among Us' Impostors Really Come From | Screen Rant
A reasonable explanation for where the Impostors in Among Us comes from has been presented, and it makes a lot of sense, especially given what little lore is known about the science fiction online multiplayer title.
Although debatable, Crewmates are assumed to be human researchers and explorers who work for and have made residence at MIRA HQ, which is located in a tall skyscraper building situated in the atmosphere above a polluted planet. Many believe this planet is the once habitable Earth, but when viewing it from the telescope on Polus, it's clearly shown to be brown and smoggy. MIRA employees have set up an outpost on Polus - a cold, snowy planet with a hot core - and they travel back and forth to these locations via a cargo spaceship called The Skeld, the original map in Among Us.
According to the premise of the game, Impostors are parasitic shapeshifters who have replaced a Crewmate and strive towards eliminating the rest of the crew. YouTuber KEVTHEKING99-YT presents his own speculation of the lore and history in Among Us, and in addition to other noteworthy assumptions, he has provided a plausible explanation for where the Impostors originally came from and how they began plaguing Crewmates.
The gist of the theory it is that the Crewmates in Among Us journeyed to Polus and found a rare mineral or power source likely needed to sustain MIRA HQ. This makes sense, because why else would they set up an outpost on a freezing cold planet if it didn't have something the Crewmates continuously needed to mine? Additionally, beside the Laboratory, an excavation site can be seen complete with a hole in the ground and tools on workbench.
In mining this resource, the crew could have also dug up the seemingly benign parasitic Impostors and decided to study them, not knowing how dangerous they would end up being. The Polus Specimen Room would support this theory, as worm-like bodies can be seen floating in the tanks. KEVTHEKING99-YT's full theory about Among Us' Polus map makes a lot of sense.
He brings attention to the broken glass found in the Polus Laboratory and theorizes that whatever happened here caused the parasitic Impostor to escape - which is how the Impostor attacks began in the first place. It would make sense that this species was laying dormant beneath the cold terrain of Polus until taken into a warmer environment to be studied, ultimately activating or awakening them.
To further support this, Impostors in Polus do not vent the way they do in the other maps. Instead, they travel through holes in the ground which they likely made in an effort to defend themselves from the scientists studying them. It seems doubtful the Crewmates in Among Us would have made these crude cavities, as the majority of their maps are more refined in comparison. As KEVTHEKING99-YT proposes, the Impostors may just be scared creatures doing what they need to survive, which includes hiding and eliminating the "enemy."
Among Us' Impostors could have hidden in one of the research boxes seen in MIRA HQ's Laboratory, and were either released there or on The Skeld as it was flying back from Polus to headquarters. This theory makes a lot of sense, especially considering InnerSloth hasn't released a lot of information regarding the game's history. It seems to fit in with the Among Us storyline, and so far no convincing counterevidence has been presented to combat this Impostor origin theory.
Source: KEVTHEKING99-YT/YouTube