The Mutator was a device which appeared inThe New Adventures of He-Man.
The Mutator was a invention of the Scientists of Primus that could change any human into a Mutant by altering the human molecular structure.
He-Man was looking for a way to infiltrate the Evil Mutants' headquarters and found this device to be exactly what he needed to accomplish this goal. Mara wondered if the machine had passed all the required tests before He-Man entered the chamber. At this time Alcon tripped and fell into the chamber, locking the door behind him and Meldoc pushed the Master Mutating switch. Thus, Alcon became the first subject to change into a mutant and back to his normal human self again.
He-Man immediately wanted to go next, dispite Mara's objections, who felt Master Sebrian should be consulted first. Indeed, because He-Man's Eternian physiology was different from that of the Primans, his mind became muddled and he did not retain his human thoughts. Instead he became a mindless brute who did not recall his own name and in a fit of rage, destroyed the Mutator machine.
Master Sebrian instructed the four Scientist to do their best and put the Mutator back together as quickly as possible, but their attempts failed, causing it to explode into even smaller pieces than before, leaving no way to turn He-Man back into his Eternian self.