Waylon Smithers has become more than just a background character at this point. After being in The Simpsons for more than three decades, Smithers has become a key part of what makes Matt Groening's animated series so successful. Smithers has even starred in a handful of episodes over the years. Now, he'll take the spotlight once again, and for a heartwarming reason after initially starting as a running joke.
Smithers' boyfriend is not Mr. Burns
For years, Smithers' sexuality was used as the butt of jokes. It didn't help that there was the episode where he dreamed that Mr. Burns would keep on screaming his name. In 2016, Smithers finally came out and confirmed that he was gay and now several years later, he'll have a romantic Simpsons episode all to himself.
The TLDR; of the episode's synopsis sees Smithers finding true love with a boyfriend. His paramour is described as a "famous fashion designer" but it's not as straightforward. The synopsis warns that the new relationship might doom Springfield. Fittingly enough, Rob LaZebnik will write the episode alongside his son, Johnny, who recently described himself as a "d'ohmosexual" and was the inspiration for Rob to write the upcoming episode.