Warning: SPOILERS for The Simpsons season 36, episode 18, "Estranger Things."After decades of The Simpsons exploring so many storylines that even they repeat one from time to time, season 36 just managed to study Marge's character from a new angle by putting a simple spin on one of her most memorable episodes. The Simpsons season 36 finale is a time-skip episode, one of many throughout franchise history that explores how the relationship between Bart and Lisa may change over the course of their future. But it leads into this storyline with a novel concept that could be skillfully reused in The Simpsons season 37.