S19E19: Mona Leaves-a

In "Simpsonlar - S19E19," the episode wraps up with Bart deciding to take a stand against the bullies who have been tormenting him. He enlists the help of Nelson, who initially seems reluctant but eventually agrees to assist Bart in his plan. Bart's scheme involves setting a trap for the bullies by luring them into an abandoned warehouse. Once there, Nelson and Bart manage to outsmart and humiliate the bullies, turning the tables on them in a satisfying reversal of fortune. Meanwhile, Lisa has been dealing with her own subplot involving a new interest in astronomy. She ends up discovering a new comet, which garners her some attention and praise from her peers and teachers. The episode concludes with the family coming together, as Homer and Marge express their pride in both Bart's newfound courage and Lisa's scientific achievement.