In days of old when knights are bold, a Game Old Knight seeks the royal castle of King Mike the Thirteenth in quest of romantic adventure. The King bids the Game Old Knight marry his elder daughter, the Ugly Princess, but the Game Old Knight refuses as he casts loving eyes upon the younger daughter, the Pretty Princess. The King, enraged, orders the Knight and his valet thrown into a dungeon and tells the executioner to sharpen the axe for decapitation. The Knight and the valet pass through several chambers of horror and meet the executioner, who sees them gloatingly. The Ugly Princess, however, secures their reprieve. Subsequently they are placed on a swiftly moving treadmill where they have to race for life to avoid being impaled on gleaming knife-blades behind and in front of them. Again the Ugly Princess comes to the rescue. She stops the old mill wheel by attaching her body to the spokes, which drag her round and round until her weight causes them to quit moving. In the melee the King and his court all receive a ducking in the mill pond. Robbers attack the castle, but they are defeated. In the end the Game Old Knight, in recognition of the Ugly Princess saving his life, marries her anyhow.