 They have grown disappointed with their creation's destructive tendencies, and intend to use the bomb to hasten what they believe is the inevitable end of the world.The only way to defuse the bomb is with the medallions, but with no instructions, Bang can only guess where each medallion is placed, and is working against a countdown timer that triggers the bomb.When Bang succeeds, the alien voices its disdain that humanity will live on and announces that the alien race intends to leave Earth to its own devices and never return.