The X Files

More than 35 thousand years ago, two cavemen hunting encounter a strange creature that can move very fast and is unlike anything previously seen. In an unequal battle with the creature, cavemen die.

Nowadays there is a small village on this place. Children are playing on the playground next to the houses, and suddenly one of them falls into the ground. His comrades are trying to figure out what happened to him. The guy shouts that everything is fine, besides, he found an obviously ancient human skull. He comes out into the light, but is in no hurry to get out of the hole. Black liquid oozes from the soil near his feet, accumulates in a puddle. The boy is fascinated by the strange substance, noticing with horror that it has begun to be absorbed into his skin. He raises his head. The guys standing at the top are screaming in fear: the whites of their friend's eyes have turned completely black. After a while, rescuers arrive, but the firefighters who went down for the boy also do not go up. Soon other people arrive at the scene, arriving in unmarked cars.

A few days later, a government building explodes in Dallas, with a boy and three firefighters among the dead. They are trying to blame Mulder and Scully, who participated in the bomb disposal operation, for their deaths.

Mulder does not believe that there were people in the building when it exploded, because the evacuation was carried out. Together with Scully, they begin to investigate the case. The situation is complicated by the fact that the department of "Secret Materials" is officially closed. Mulder and Scully continue to investigate unofficially and uncover a government conspiracy aimed at colonizing the planet by aliens.