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1). Hit Frank the Pug. He is on the right hand side on a news stand right after the scene with the crashed space ship. Hit his collar, it's where the sensor is.
2). After you turn to the left, there's a window with a big eyeball in it, and outside are the aliens arms holding guns, and his arms are moving. Hit the guns straight on.
3). Hit more window aliens, and keep on them, shooting over and over.
4). Hit the eyes in the trees, over and over.
5). Hit the exhaust port as much as you can.
6). Hit the red button.