
The Seemingly Never-Ending Story
The family is on a nature walk through “Carl’s Dad Caverns,” when Homer tries to get a piece from a stalactite. This results in the family falling through the cave floor and winds up with Homer getting stuck in the ceiling of one of the lower chambers of the cave. Marge, Bart and Maggie go off to find help, while Lisa stays behind and tells her father a story to pass the time. Her story involves running from a bighorn sheep and into Mr. Burn’s mansion. The pair evades the tenacious sheep by finding refuge in the mansion’s attic, where Mr. Burns tells her the story of how he came to work at Moe’s Tavern by losing a scavenger hunt with a rich Texan. While there he learned (and tells to Lisa) the tale of the Moe’s treasure. The stories within stories culminate in the fate of the treasure being determined in the cave.
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More from this season

S17 E1
The Bonfire of the Manatees
After Homer gets into trouble over his football gambling debts, he allows the Springfield Mafia to shoot a "snuggle film" in the house without Marge's permission. When she and the kids return home from a trip to "Santa's Village" and find production still going on, a furious Marge leaves for the beach and encounters a marine biologist named Caleb Thorn who has dedicated his life to saving manatees.

S17 E2
The Girl Who Slept Too Little
After the family successfully protest against a stamp museum being built next to their house, a cemetery is built near the Simpson house instead, making the normally unflappable Lisa realize that someone as smart as her can be afraid of something.

S17 E3
Milhouse of Sand and Fog
Never one to miss the opportunity to make a quick buck, Homer cashes in on Maggie's bout of chicken pox. He decides to host a Pox Party and charges parents to infect their children.

S17 E4
Treehouse of Horror XVI
Bart ends up in a coma after attempting to jump from the roof to the swimming pool at Spinster Arms Apartments, while attending a hunting party at Burns Manor, Homer panics and believes the prey is the hunting party, and after losing a Halloween costume contest to Dr Hibbert as Dracula, a real witch puts a spell on the people of Springfield.