This is a 1:1 replica made by Sideshow Collectibles of an alien that terrorizes Agnes Moorehead in the Season 2, Episode 15 story from the TV anthology, "The Twilight Zone (1959)." The episode, called "The Invaders," finds a backwoods woman fighting aliens who have landed their spaceship on the roof of her rural home. In typical "Twilight Zone" fashion, there is a twist ending regarding the woman and the aliens.
