Aldo is 11 and crazy about comics. He and his friends, Arnie and Ian, have even set up their very own Comics Club, sure that it’ll be the perfect screen once the time comes for them to save the world. Between them and glory is Petra, Aldo’s 7-year-old cunning, determined little sister. One dark, stormy night things get complicated when a one-eyed cat shows up at their front door. They decide to adopt him and name him Odin, completely unaware that inside the kitten hides his namesake: the great, mighty, hot-tempered Norse god, whose final battle, Ragnarök, is about to begin.