RIP Mark Taylor | Source: The Toys That Made Us (Nacelle Co.)/The Toy Book

A legendary figure in the creation of Mattel’s Masters of the Universe (MOTU) franchise has died.

Designer Mark Taylor was credited with shaping much of the MOTU aesthetic and the design for countless characters that contributed to the massive success of the MOTU brand in the 1980s. While formal credits for the development of He-Man and Skeletor have often been disputed over the years, Taylor’s work, along with that of another Mattel designer — Roger Sweet — eventually became the toys that are familiar to millions.

Some key design elements that shaped He-Man and other residents of Eternia were pulled from Taylor’s Torak: Hero of Pre-History, a barbarian-esque character that was in and out of development for many years pre-dating the launch of the MOTU brand in 1982.

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Taylor’s work at Mattel began in the 1970s as a member of the Visual Design Group working on packaging for Barbie. Following his work on the MOTU franchise, Taylor went on to become a key figure in the development of the original Teenage Mutant Ninja Turtles (TMNT) line at Playmates Toys in 1987. Taylor’s work has been explored in numerous documentaries, including Power of Grayskull and The Toys That Made Us.

His Christmas Eve passing was confirmed by his wife, Rebecca Salari Taylor via Facebook.

Mark Taylor was 80 years old.