Dennis tries to launch a rocket to explore the galaxy. When his first attempt fails, Dennis is inspired by the mayor's call to make Beanotown Green-o-town and tries other fuel sources to launch his space mission. Dennis's seemingly maniacal commitment to the eco-drive earns him an award from the mayor, but just as Dennis's contribution is about to be recorded, the whole of Beanotown discover what Dennis has really been up to, with explosive results!