Donald Duck is testing Gyro Gearloose's new time machine. The machine is so unpredictable that Huey, Dewey, and Louie warn Donald that he might end up at any time in the past, and thus advise him to do the testing at the Stonehenge, which has remained unaltered for millennia.
Donald, Gyro, and the boys travel to the United Kingdom to test the time machine at Stonehenge. The machine sends them centuries to the past, to time of sub-Roman Britain. There, the ducks meet "King Arthur"—Artorius Riothamus, the last descendant of Lucius Artorius Castus, and find out that he is nowhere near the glorious benevolent ruler history has made him to be; instead, he's a common warlord without much morals to speak of. Fearing the ducks are Saxon invaders, Arthur kidnaps Donald and his nephews, and is about to execute them, but at the last moment, Gyro sounds a car horn, which scares the Britons off.
Arthur goes after Donald, intending to finish him off, but a combination of Gyro's technology and the mystical power of the Stonehenge gives Donald awesome powers. An epic duel ensues between Arthur and Donald. In the end, Arthur strikes his famous sword into a stone, but is unable to get it out. Gyro's Little Helper, imbued with the mystical power, pulls it out and drives the Britons off, giving Gyro time to transport the ducks back to the present.
This comic is based on the Pertwillaby Papers adventure Knighttime, and makes the Pertwillaby Papers adventure seem incomplete.
The story's name is a parody of T. H. White's Arthurian novel, The Once and Future King.
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