James Gordon MacArthur was an American actor who is best known for his role as Danny "Danno" Williams on the CBS police procedural drama series Hawaii Five-O from 1968 to 1980.

His Disney roles included Johnny Butler/True Son in The Light in the Forest, Rudi Matt in Third Man on the Mountain, David Balfour in Kidnapped, Fritz Robinson in Swiss Family Robinson, Cpl. Henry Jenkins in the Walt Disney's Wonderful World of Color episodes Willie and the Yank: The Deserter and Willie and the Yank: The Mosby Raiders, himself in The Wonderful World of Disney: 40 Years of Television Magic and The Age of Believing: The Disney Live Action Classics, and the narrator for Swiss Family Robinson: Adventure in the Making.

He was the adopted son of actress Helen Hayes.

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