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.
Dan Castellaneta
Homer Simpson (Voice)
Julie Kavner
Marge Simpson (Voice)
Nancy Cartwright
Bart Simpson (Voice)
Yeardley Smith
Lisa Simpson (Voice)
Hank Azaria
Moe Syzlak (Voice)
Harry Shearer
Mr. Burns (Voice)