Irrational Treasure [800th episode]
Marge's crusade to get the family dog in better shape leads to her entering Santa's Little Helper in canine agility competitions and a trip to the National Dog Show in Philadelphia. There, Marge and Homer suddenly find themselves - and the dog - mixed up in a historical conspiracy adventure worthy of a "National Treasure" movie.
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More from this season
S37 E1
Thrifty Ways to Thieve Your Mother
When Lisa starts wearing Marge's "vintage" clothes from the 90's, she's welcomed into the school's super-elite fashion club. But as they run out of retro looks, the funky fashionistas become obsessed with getting more... by hook or by crook.
S37 E2
Keep Chalm and Gary On
Homer gets Superintendent Chalmers a job at the power plant. There, Chalmers discovers huge mutated snails that produce valuable slime launching his new career as a man-o-sphere guru.
S37 E3
Treehouse of Horror XXXVI
Springfield is threatened by a mysterious killer monster emerging from the sewers, Krusty welcomes a demonic guest to his Halloween special, and the action moves a thousand years into the future in a post-apocalyptic, plastic version of the city.
S37 E4
Men Behaving Manly
Springfield's men are in crisis.