A former boxer known as Old Leather Face opens a nightclub called the Zoo, which does not do a good business. A group of homeless teenagers want to rent the place and start what they hope will be a profitable business, but a gang threatens to shut it down. Old Leather Face accepts the teenagers offer and becomes involved with trying to help them succeed.

After being busted out of jail by his tomatoes, Professor Mortimer Gangreen begins a new plot to take over the world by inserting his hapless lackey Igor into the throne of the King of France.