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.

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Main Cast: Yeardley Smith, Joseph Gordon-Levitt, Harry Shearer, Dan Castellaneta, Julie Kavner, Nancy Cartwright, Hank Azaria, Pamela Hayden, Maggie Roswell, Alex Désert

Directors: Mike B. Anderson, Mike Frank Polcino

Writer: Matt Groening

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Cinematographer:

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