The Simpsons Season 3 Episode 21 (04/09/92)
Selma reveals she has a new boyfriend from the prison pen pal system... Sideshow Bob! Although Bart suspects he's still evil, Bob proves to everyone else he's changed and gets out of prison and marries Selma. However, during the honeymoon Bob attempts to murder Selma, but not before Bart is able to stop him.