The Singer Duke Mitchell meets Sammy Petrillo in this parody of Martin & Lewis. They arrive on a jungle island, where a mad scientist played by Bela Lugosi makes human experiments.
Jimmy and Cannonball escort Anne Lamont, the new school teacher, to Oreville, where she is molested by two outlaws. Marshal Blackjack Flint wounds Slade, who tells Derringer that lawman Flint is wanted by the law and, unknown to Anne, is also her father. Derringer than kills Slade and begins to blackmail Flint. Jimmy and Cannonball join the fray on the side of Flint, the reformed outlaw.
It's 1873 and the disbanded Texas Rangers have been replaced by the corrupt Texas State Police. Steve Lanning arrives posing as a wanted outlaw to get in with them in his attempt to have them replaced. His inside work helps the Durango Kid break up the State Police raids but he is in trouble when his secret identity as Durango becomes known to them.
