The Good, the Sad and the Drugly (S20E17)

While visiting his Grandfather, Bart meets a sweet fifth-grade girl, who makes him pretend to be a goody two-shoes. But when a jealous Milhouse learns of the romance, he threatens to reveal Bart's past. Meanwhile, while doing a report on Springfield in the future, Lisa becomes depressed at the fate of the world. She is cheered up by an anti-depressant for children, Ignorital, until Marge realizes her daughter has lost too much touch with reality. (Prime Video)