Synopsis by Mark Deming
Marge Simpson (voice of Julie Kavner) may not have a perfect marriage, but her sister Selma (also voiced by Kavner) seems ready to settle for whatever kind of husband she can find, and begins corresponding with a prisoner at the Springfield Penitentiary after concluding she can't find an eligible man among the law-abiding. It turns out the prisoner in question is none other than Sideshow Bob (voice of Kelsey Grammer), who ended up behind bars after Bart (voice of Nancy Cartwright) exposed his plan to frame Krusty the Clown (voice of Dan Castellaneta) for robbery. Selma and Sideshow Bob decide to tie the knot, but Bart is convinced Bob has something up his sleeve, and after viewing a video of the couple's vacation trip, Bart must run to the rescue to prevent Selma from being murdered. Black Widower first aired on April 8, 1992.