Led by Selma, the survivors (which include the Simpsons, Lenny, Carl, Sideshow Mel, Comic Book Guy and the Old Jewish Man) decide to climb up the decks to the engine room, during which Lenny falls to his death, saying that it is "too confusing" to carry on.
Under Selma's leadership, a group of survivors (including the Simpsons, Lenny, Carl, Sideshow Mel, Comic Book Guy and the Old Jewish Man) attempt to reach the engine room by climbing the decks.  Lenny dies during this climb, stating that it is too confusing to continue.