Feature version of the 1943 serial "The Masked Marvel", q.v., edited for television syndication and 16mm rental only.

It's carnival time, crowds gather for horse races and the games and food of a midway. Bobby the singing jockey will be riding the favorite Stardust, and if they win, the prize money will enable Bobby to ask Maggie, a carnival florist, to marry him. Tony, an exuberant balloon man, happens on a plot to hobble Stardust. Tony has bet his business on the race's outcome. How will Stardust do?

A team of two-fisted insurance investigators (one of whom disguises himself as The Masked Marvel) endeavor to discover and thwart the loathsome saboteur Sakima.