Mer-Man is Skeletor's second most notorious henchman. He is a character appearing in the Turtles of Grayskull (mini-comics) and Turtles of Grayskull (comics).
Turtles of Grayskull[]
Mer-Man is one of the mutants who ambush the Turtles and Teela. Belly of the Beast (Man)
After traveling to Castle Grayskull to find answers, the Turtles, April O'Neil and Casey Jones are sent to the Dwell of Souls by Sorceress. There they encounter Splinter-Skull, who tells them that the Sword of Power calls through him and is hiding from its master, He-Man, fearful that it will be found by greater evil. Splinter-Skull says they must recover it first. Leonardo asks where it is and Splinter-Skull says it is on the Forgotten Island. The sword will help him guide them, but they must be careful because there are dangerous forces at work. Upon arriving at Forgotten Island, the Turtles spot the sword embedded in a tree stump, but they are immediately attacked by Mer-Man. The Turtles not only have to dodge the giant sword that Mer-Man wields, but also his tail, which drips with ooze. Raphael manages to jump and strike Mer-Man’s chest, pushing him off balance, and Donatello quickly steps in to club him over the side of the spire. The Spirit of Gray-Shell
After mutating many of his henchmen, Skeletor and Krang advance on Castle Grayskull. Among them is Mer-Man. He-Man in a Half-Shell
Mer-Man is among the Evil Warriors, in service to Skeletor, who join the major battle against the Masters of the Universe. Turtles of Grayskull issue 1