Invader Zim cartoon cereal design. Invader Zim Gir's Krixpy Cereal is 100% authentic, officially licensed Invader Zim merchandise! Invader Zim is an American animated science fiction television series created for Nickelodeon. The show centers on an extraterrestrial named Zim, and his mission to conquer Earth and enslave the human race along with his malfunctioning robot servant GIR. 8.5 oz, Classic fit, Twill-taped neck