In the 1920’s a space vehicle full of alien pirates land in Cincinnati. To cloak their presence, they engage a device that blankets the entire planet. Unknown to them, the vibrations of their machine will merge with the vibrations of a machine created by none other than Uncle Shelby to a create a wave that will do no less than erase all of existence. C. McCall, the time-traveling stand-up comic must return to the vaudeville theatre the creatures are using as a base and turn off the machine. This time, however, he doesn’t have to work alone. Also present is a younger version of his Uncle Shelby than he has ever known. The genius that created his time machine will join McCall in the battle, along with Buster Keaton, Babe Ruth, Lou Gehrig, Harry Blackstone and Edgar Bergen. With the aid of a couple of others, this crew must devise an attack plan that is flawless. And only Al Capone and the contents of a ventriloquist’s dummy make it possible.