Prince Adam is the alter-ego of He-Man. They are a fictional characters in the Masters of the Universe franchise. He-Man and his friends defend Eternia and the secrets of Castle Grayskull from the evil forces of Skeletor.
Adam appears in "Brian the Bachelor" as a contestant on The Bachelorette taking the donkey that was intended to be for Brian. He used his sword to simultaneously transform himself and the donkey into He-Man and Battle Cat, respectively.
Brian tries to join Stewie playing with his toys of the Transformers and He-Man with Scotty Jennings in "Livin' on a Prayer", unaware of who the characters are. Stewie becomes upset when he wants to involve the two groups of toys together.
He is voiced by John Erwin, who reprised the role.