Man-at-Arms is one of three people on Eternia who knows He-man`s secret identity. Duncan (his first name) comes from a long line of scientists and armament specialists who have served the good forces of Eternia for generations. He fought alongside his closest friend King Randor (then Captain Randor) when Keldor and his forces attacked the Hall of Wisdom.

Man-at-Arms prefers tinkering in his lab, but when it comes time to battle he girds himself in special automatic armor that contains an array of gadgets and devices depending on who or what he faces. He mentors Prince Adam and trains Teela in all the arts of defense and offense.

Man-at-Arms is Fisto`s brother.

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