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...
Principal Skinner promises the students that the best-behaved can take a ride in a submarine. Bart believes his past indiscretions will be forgotten. Lisa tries to help Krusty by suggesting him to sell the foreign rights to his shows.
Mr. Burns' Christmas present to his employees, a pair of augmented reality glasses, places a strain on Homer and Marge's relationship. Meanwhile, Bart wrestles with giving a Valentine's Day card to Nelson.
When Abe and two of his friends move in with the Simpsons after the Springfield Retirement Castle closes, Homer begins to embrace their lifestyle. Meanwhile, Nelson initiates Bart into the bully group after coming to his defense.