Another well crafted episode of the Twilight Zone, well except for the very poor special effects (Pay attention to the alien spaceships in the final scene) which looks made out of cardboard and painted by a 5 year old.
An alien race comes to earth to end with the human race because we are not good enough. The UN begs for an opportunity to show that we are "good" and it is given 24 hours while other spaceships arrive.
The panic the UN delegates go through must have been incredibly big. If i was one of those leaders I would have begged for total annihilation for the human race is scum.