The unnamed baby kangaroo is an extra added gift that comes with Hoppy the Kangaroo, given as a gift to Mickey Mouse in the 1935 animated short, Mickey's Kangaroo.

Role in the Short

A friend in Australia has sent Mickey the kangaroo Hoppy, who with her pesky son, drives Pluto completely to distraction. Mickey wants to train the kangaroos to be fighters, but they end up throwing him in his own hay-baling machine.