The boys trap the villain and recover the booty.
And for the most part, my opinion of these shorts is that they are all average to below average--some of them being downright terrible i.
But just because it was done before, it's still good for a laugh, the Three Stooges chasing MacDonald and being chased by a lion they free.
There is a similar one like this called Hold That Lion and I strongly recommend both of these Three Stooges shorts! Some of the creatures are borrowed from fiction, such as the Erb and the Leucomorph the big tentacled thing on the cover from Jack Vance and the Coeurl from A.