class LaserBeam:
    def __init__(self):
        pass

    def fire(self):
        pass

    def activate_super(self):
        pass

    def destroy_planet(self):
        pass


class Shield:
    def deploy(self):
        pass


class Missile:
    def launch(self):
        pass


class SpaceInvaders:
    def __init__(self):
        self.laser = LaserBeam()
        self.shield = Shield()
        self.missile = Missile()

    def summon_mothership(self):
        pass

    def destroy_planet(self):
        pass

    def teleport(self):
        pass

    def invoke_aliens(self):
        pass

    def invade_earth(self):
        pass

    def takeover_galaxy(self):
        pass