The stooges are working as paperhangers in the home of Professor Panzer, a mad scientist looking for a brain to use in his experiments. The professor wants to put a human brain into a gorilla but has trouble finding a brain small enough, which leads him to select Curly (for obvious reasons) as the perfect donor. The stooges manage to foil the madman with the help of the Gorilla who befriends Curly. (thetvdb.com)