In "Coralisa", Snowball shows Lisa a tunnel that takes them to a parallel universe. The parallel universe has the Simpson family with buttons on their eyes. Lisa becomes scared and goes back to her real family when they want to put buttons on her eyes. However, she goes back to the parallel universe when Homer tries to kill a snake with her saxophone. After a few days, the real family can not find Lisa. Bart finds the tunnel and goes to the parallel universe. Marge and Homer go to the universe to try to get Bart. Homer kills the fake Bart and the fake Homer dies trying to save Bart. Fake Marge turns into a creature similar to a spider and tries to hurt the real Homer. Homer makes the family from the parallel universe go to the real universe to do housecleaning.