In Victorian England, an American showman uses a wealthy Frenchman's finances to build a German explosives expert's giant cannon designed to fire a people-filled projectile to the Moon, but spies and saboteurs endanger the project.

Phineas T. Barnum and friends finance the first flight to the moon but find the task a little above them. They attempt to blast their rocket into orbit from a massive gun barrel built into the side of a Welsh mountain, but money troubles, spies, and saboteurs ensure that the plan is doomed before it starts.—Rhino <[email protected]>