Homer and Bart become kings of the blue-collar sports circuit, but Marge suspects something dishonest at the core of their father-son bond.

Lisa travels back in time to 1923 and discovers that the Springfield Mini Moose, once key to the town’s ecosystem, were driven to extinction in 1925. Teaming up with young Monty Burns, Lisa works to save the moose, but her actions unintentionally shape his future as a ruthless tycoon.