Kamp Krusty (S04E01)

Bart and Lisa go off for the summer to Krusty's camp for kids, but instead of meeting Krusty they meet his bean-counting surrogate, Mr. Black. With their children gone, Homer and Marge enjoy a romantic summer, but Bart and Lisa are put to work making crummy merchandise, until Krusty returns and sets things right - by taking the kids to Tijuana. (Prime Video)