Description by couchtuner for The Simpsons Season 7 Episode 4 : After perpetrating a prank on the First Church of Springfield, Bart sells his soul to Milhouse for five dollars. Bart comes to regret his decision, and goes on a desperate quest to regain his soul. In the end, he gets it back with the help of an unexpected source.
Watch It Here : The Simpsons Season 7 Episode 4 Bart Sells His Soul