2009 год. The terrific trio are back in their fourth gross-tastic adventure. When the Kleanonz, the cleanest aliens in the galaxy, land on earth, they are shocked, horrified and appalled – it is the dirtiest planet in the universe. In their mission to clean up the solar system, the aliens have no choice but to eliminate earth and all its inhabitants. Fortunately Gerald, Gene and Fleabag get wise to the plan. Harnessing Fleabag’s Gross-Out Powers, they rocket-boost into outer space in an attempt to stop the Kleanonz. But can they save earth from the biggest spring clean in history?