The Simpsons - Season 15 Episode 13

Apu and Manjula are signing up two of the octuplets for Miss Wickerbottom's Pre-Nursery School and after a verbal exchange with Dr. Hibbert, Homer decides they should do the same for Maggie. Because she can't talk, she doesn't pass the initial screening. Afterwards Lisa discovers that even though Maggie can't talk she does show signs of brilliance. Another screening at the pre-pre school shows of her talents and reveals that she has a higher IQ than Lisa. Maggie's new brilliance leaves Lisa searching for a new identity, since she no longer has her status as "the smart one." Lisa tries stand-up comedy, becoming a goth ‘Ravencrone Neversmiles,' cheerleader, rapper, soccer player, cowgirl; none of which workout for her. After she is discovered trying to sabotage her sister's education Lisa leaves home with 2¢ to her name. She decides to stay at the Natural History Museum, where her family is sure to never find her; however Springfield's "finest" do discover her location and they bring the family to help them find her. An accident gets Marge, Bart and Homer trapped in an exhibit and they look to Maggie to get them out, but Maggie's secret to her brilliance is nowhere to be found.