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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; Lisa and young Monty Burns team up to save the moose, but she unintentionally shapes his future.
Rated PG | Length 22 minutes
Dan Castellaneta | Julie Kavner | Nancy Cartwright | Yeardley Smith | Hank Azaria | Harry Shearer | Joseph Gordon-Levitt | Pamela Hayden | Tress MacNeille