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
Yeardley Smith | Joseph Gordon-Levitt | Harry Shearer | Dan Castellaneta | Julie Kavner | Nancy Cartwright | Hank Azaria | Pamela Hayden | Maggie Roswell | Alex Désert | Tress MacNeille | Kevin Michael Richardson | Dawnn Lewis | Chris Edgerly