Snacking, napping, fighting aliens - it's all in a day's work for Garfield! One minute, Garfield and his pals are having a cookout, the next, they're engaged in a super battle with a sinister alien and her army of zombies! When an evil comic book demoness tries to make everyone in Cartoon World her slaves, all the comic strip characters become superheroes in order to thwart her. Well, all except Garfield, who thinks being a superhero sounds like too much work! But when he sees all his friends in trouble, the fat cat might have to rise to the occasion!