Artemus Knab is the multimillionaire in Gotham City. He is the owner of his supersonic plane "The Retsoor".
History[]
During The Puzzler's crime spree, the villain first visited Knab to become partners with him in the puzzle balloon business. Though warned by Batman that the Puzzler was dangerous, Knab wouldn't heed. Next Puzzler subsequently steals all the guests' jewels at Knab's party by using his special Puzzle-Gas. The Dynamic Duo arrived too late to stop the puzzling criminal, who gasses them as well before making his getaway.
Putting the next step of his plan in action, the Puzzler visits Knab, drugging the millionaire and photographing the top-secret plans for a plane called the "Retsoor", so he could steal it. He was later recovered by Batman and Robin after Puzzler's capture and the puzzle balloons were bought by the Wayne Foundation to be used for children.