He-Man and the Masters of the Universe is an American animated television series produced by Filmation based on Mattel's toy line Masters of the Universe.
The show, often referred to as simply He-Man, was one of the most popular animated children's shows of the 1980s, and has retained a heavy cult following to this day.
It made its television debut in 1983 and ran until 1985, consisting of two seasons of 65 episodes each.
Reruns continued to air in syndication until 1988, at which point USA Network bought the rights to the series.
USA aired He-Man until September 1990.
Man-At-Arms is He-Man's closest ally, originally packaged in the Mattel toy line as the 'Heroic Master of Weapons'. He is Teela's adoptive father and is the inventor of most of the weaponry and vehicles used by the Heroic Warriors. Since Man-At-Arms is actually a title, not a name, the character is also known as Duncan. The original minicomics depicted him as the latest in a long family line of great warriors and inventors, who uses the material resources at his disposal to aid He-Man.