watch 01:27 The Loop (Movies) Do you like this video? Joe Mantegna. Joe Mantegna will perform the voice of Grem in Cars 2. Wikipedia has an article related to: Joe Mantegna He is most popular for portraying the voice of Fat Tony in The Simpsons. Retrieved from "https://pixar.fandom.com/wiki/Joe_Mantegna?oldid=58755" Categories: Cars 2 Actors Community content is available under CC-BY-SA unless otherwise noted.