Homer and Marge have a fight when Homer realizes Marge married him because she was pregnant with Bart. He decides to leave the house and tries moving in with Milhouse's dad.
After not being able to sleep, he's eventually taken in by Karl, his old assistant. It turns out that Karl has a flamboyant lifestyle which Homer gets a heavy dose of.
Homer tries to get back together with Marge, but he screws it up and goes out drinking - heavily. He ends up in the hospital where he and Marge reconcile. Homer realizes that Marge loves him and that's all that matters. He moves back home.