You will see a cutscene before the level. The cutscene will be a guy from the FBI watching TV and the Alien is flying his/her spaceship above Earth when the guy wakes up and zaps his spaceship. The Alien is trying to land on Earth. He crashes and then the FBI come to clean and take the spaceship. The level starts.

On Easy you have 7 grenades, 7 lives, and 7 coins

On Normal you have 5 grenades, 5 lives, and 7 coins

On Hard you have 3 grenades, 5 lives, and 3 coins

You will see a fat kid and he will give you a power up.

The first being a robot, the next being install ball.