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The aliens are gaining on our hero! In a surprise move, Spaceman Spiff shifts into reverse! The aliens roar ahead! Spiff shifts back into forward, and pursues the aliens! ... but the aliens have turned around and are headed straight for our hero! Spiff shifts into reverse! I'm getting sick.
Spaceman Spiff is trying to outrun aliens. He shifts into reverse. As the aliens pass, Spiff shifts to forward and chases the aliens. The aliens turn around, so Spiff shifts back into reverse. Calvin, riding in a swing, feels he's getting sick.