After Ned Flanders sees an exhibit on evolution at a museum, he and Reverend Loveoy talk Principal Skinner into allowing the teaching of creationism in schools. When Lisa complains at a town meeting that there should only be one theory taught in schools, Mayor Quimby agrees - and teaching evolution is banned in schools, so Lisa decides to teach a secret evolution class which gets her arrested. Does Marge have something up where her sleeves would be if she didn't always wear a sleeveless dress to help Lisa?