In 1947, a UFO crashed on the outskirts of Roswell, New Mexico. Although at the time, there were varying opinions and arguments as to what that UFO actually was, the fact of the matter was that, crash or no crash, whoever or whatever sent that UFO had accomplished its mission. Now, decades later, during the city's annual July 4th UFO Festival, which draws in thousands upon thousands of people, they'll get to experience the horrifying objective of the 1947 crash, via a horrifying, highly contagious virus that turns its host into literal, out of this world, monsters.