The 30th Treehouse of Horror features a demon Maggie, a mission to rescue Milhouse from another dimension, dead-Homer's spirit trying on some new bodies for size and Selma finally finding love in an unlikely place – the alien in the basement.

When Marge realizes that everyone views her as boring, she takes up competitive lumber-jacking as a hobby (and has a real gift for it). The circuit of competitive timbersports takes her on a month-long retreat to Portland with her trainer, Paula, whom Homer worries is going to steal her away forever.