Buster is lying in bed, staring at the blinking light on the smoke detector on his ceiling. He imagines it is a Flying Saucer that lands in his backyard.
According to Buster, we must:
"Drag and drop alien parts from the left screen to the right screen. Drag a part to the recycle bin to get rid of it. Click RANDOM to get a pre-built alien that you can edit. Click START OVER to clear your alien and build a new one. Once done building the alien of your dreams, click DONE."
When we are done, the flying saucer takes Buster to Planet X, Milky Way, which is a planet inhabited by the alien we have designed. A newspaper ("The Daily Alien") appears - featuring Buster and the Supreme Ambassador alien - which we can print so we can save our designed alien.