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Denver Jenkins is a fifteen-year-old computer-hacking Californian. Big Louis, Turnip, and Dandelion are three accidental-prone aliens who have managed to end up at the wrong end of the galaxy. When Denver encounters the aliens, he discovers that an impending cosmic catastrophe threatens all life on Earth and that the future can only be saved with the help of the aliens' superior science and the hidden mysterious powers of a bunch of young earthlings.