A year after the events of Cartoon AllStars, Lincoln Loud and Clyde have become super fans of the heroes who saved the world from the evil conqueror known as Grogar. And now, Lincoln is seeking a way to join the group himself and he may get a chance to prove himself to the heroes when yet another extraterrestrial entity named Caldor invades Royal Woods and turns it into a home base for an invasion on the rest of planet earth. Meanwhile, outside military forces are attempting to rectify the situation as well as prevent Lincoln from getting involved in the debacle.
