In this game you're Bart in Springfield and you need to defeat the Alien Mutant Invasion! The Mutants have finally came to Springfield stronger than before and used their Wacky Weapons to many people in Springfield! The only survivors are The Simpsons family, Krusty The clown and all of the animals, but Bart is the only one who can stop the invasion! Use your Slingshot to kill enemies and level up and also gain coins to buy stronger weapons to truly defeat the Invasion! You can even defeat the Giant Mutants to get EVEN MORE COINS! Join Bart and His friends now to stop the mutant aliens and their Wacky Inventions now in Bart vs the Space Mutants!