The episode features "G-G-Ghost D-D-Dad", "Scary Tales Can Come True" and "Night of the Dolphin" and was written by Rob LaZebnik (story by Mike Scully), John Frink and Don Payne and Carolyn Omine and directed by Matthew Nastuk.

This year's installment sees Homer as a wandering spirit who must do one good deed before going to Heaven ("G-G-Ghost D-D-Dad"), Bart and Lisa as genre-savvy peasant children who end up lost in a fairy tale forest in "Scary Tales Can Come True", and Springfield's population at war with sea mammals in "Night of the Dolphin".

They stab Marge and Grampa in the chest with stakes, set Homer on fire, and activate a bear trap on Bart's head, leaving Lisa unharmed; she then walks away from the scene while whistling, pretending that she had no connection to the monstrous family.

Homer screams in pain, but Satan tells him to be quiet as he will "wake up John Wayne", who has already woken up for his day in Hell.

After Homer lost his job as the village oaf, he abandons Bart and Lisa in the woods to solve the family's food shortage.

When Lisa scoffs at this, the witch attempts to throw her into the oven, but Homer arrives to save the children, eating his way through the gingerbread house's walls.

The Simpsons are reunited, and are now living happily ever after with a mostly restored Homer still having a chicken's lower body as he produces eggs for the family, meaning that they will never go hungry again.

The dolphins attack Springfield, first killing Lenny during his whiskey-soaked night swim ("alcohol and nightswimming: it's a winning combination") and then the Sea Captain (who claimed he could stop them) before marching towards the town on their tails.

When Lisa is bitten by a small dolphin after removing a set of bottle rings around its face, Homer encourages the townspeople to fight back.

Lisa admits she regrets freeing Snorky in the first place, but Marge comforts her that everyone will have to adjust to their new life as "marine animals".

Meanwhile, after the final story ended, the two aliens Kang and Kodos complain that they have been left out of the Halloween special, until they get an offer to do commercials for Old Navy which they accept.

The episode was directed by Matthew Nastuk and written by Rob LaZebnik, John Frink, Don Payne, and Carolyn Omine.

The first segment, "G-G-Ghost D-D-Dad" was written by Rob LaZebnik, but the idea came from then current show runner, Mike Scully.

[1] The second segment, "Scary Tales Can Come True" is the second written by John Frink and Don Payne after "Insane Clown Poppy", but that did not air later in the season.

It's really hard to fault a mainstream network TV series that references glory holes, so "Treehouse XI" gets a positive appraisal despite a few missteps.