'Ender's Game': Final poster warns 'This is not a game'

The "Ender's Game" theatrical release is still nearly three months away, but the movie's final poster has debuted. The movie, starring Asa Butterfield, Ben Kingsley, Hailee Steinfeld and Harrison Ford finds teenagers being trained for an army to protect the earth against an impending alien invasion.

Butterfield plays the story's main character, Ender Wiggin, who shows a certain brilliance in his training and will prove to be an important piece of the puzzle when it comes to the eventual war.

"Ender's Game" is in theaters November 1. Check out the full poster below:

Photo/Video credit: Summit