King of the Carnival is a 1955 Republic movie serial that contains a substantial amount of stock footage from the earlier Republic serial Daredevils of the Red Circle. It is the 66th and final serial produced by Republic and is often considered to be among the studio's worst. The plot concerns treasury agents investigating a Cold War counterfeiting operation believed to be connected to a circus.

Plot

Treasury agents Art Kerr and Jim Haynes are investigating a global counterfeiting operation believed to be linked to the circus. Acrobat Bert King agrees to help his old friend Art search for the counterfeiters, and his acrobatic partner June Edwards assists him. They are repeatedly threatened by two thugs, Daley and Travis.