Once on the planet to our friends the birds flew in a spaceship. All the birds gathered in the ship landed in anticipation of a miracle, but of the ship were nasty green pigs - aliens. They began to dictate its policies and angry birds. The war began, the good old slingshot back in business. Otbey planet in pigs using a slingshot and evil birds. Bring down the entire power of the birds on the bad pigs.