As I have mentioned before The New Adventures of He-Man series often told stories that I wish had been written for the Filmation show. "He-Man Mutant" is one such episode. In the story He-Man, in an attempt to spy on the Mutants, offers to transform himself into a creature that could pass for a Mutant. However, after the transformation it becomes obvious that his mind has become warped and the protector of Primus legitimately joins Skeletor and Flogg. The one problem I have with the episode pertains to the visual look of He-Man as a Mutant. We can clearly see that he still wears the same clothing as He-Man; he even has a ponytail! And yet Skeletor, who is an intelligent being throughout the series, does not cotton on to the resemblance!
(click on the image to see it at full-size)