 The episode , like the other Treehouse of Horror episodes , comprises three self @-@ contained segments . In " School Is Hell " , Bart finds his ideal new school in Hell ; in " A Clockwork Yellow " , Moe leads a Clockwork Orange gang ; and in " The Others " , the Simpson family are visited by their former selves . A clip from the episode was first shown to the San Diego Comic @-@ Con in July 2014 , and showrunner Al Jean gave an interview about " The Others " in September . The final segment features a sequence in which the Simpson family is animated in the styles of several other media franchises , in which Pixar 's John Ratzenberger provides the guest voice of a computer @-@ generated Homer . 
