Jin and K are ordered to investigate an alien crash site, but suspect that the survivor fled the scene. From the blood left at the crash site, Agent S determines the survivor as a known alien species who have been taken refuge on Earth after their home world was invaded by the ferocious Vo-Da aliens.

As Agent K investigates the appearance of a UFO in the sky, he is confronted by an army of aliens, the Vairo, who emit a deadly high-pitched scream.