She-Ra in the context of "Superheroine"

He-Man is a superhero and the protagonist of the sword and planet Masters of the Universe franchise, which includes a toy line, several animated television series, comic books, and a feature film. He-Man is characterized by his superhuman strength and in most variations, is the alter ego of Prince Adam. He-Man and his friends attempt to defend the secrets of Castle Grayskull, the planet Eternia, and the rest of the universe from the evil forces of his archenemy Skeletor. He-Man is the twin brother of She-Ra.

The character was created by designer Mark Taylor, who based the character on his childhood drawings. One of Taylor's designs was used by Mattel designer Roger Sweet in his pitch to Mattel for a new action figure line. Sweet also chose the name "He-Man" and suggested that it have a twist-action waist. Sweet sculpted and presented three different versions of the figure to Mattel—including a soldier, spaceman, and barbarian—the barbarian version was chosen and developed into the character's current form. Afterwards, Sweet was taken off the project and Taylor was assigned principal design duties.

Masters of the Universe (sometimes referred to as the He-Man or She-Ra series) is a sword and planet-themed media franchise created by Mattel. The main premise revolves around the conflict between He-Man (the alter ego of Prince Adam) and Skeletor on the planet Eternia, with a vast lineup of supporting characters in a hybrid setting of medieval sword and sorcery, and sci-fi technology. A follow-up series, She-Ra: Princess of Power revolves around He-Man's sister She-Ra and her rebellion against The Horde on the planet Etheria. Since its initial launch, the franchise has spawned a variety of products, including multiple lines of action figures, six animated television series, several comic series, video games, books and magazines, a daily newspaper comic strip, and three feature films (one animated, two, live-action).

Castle Grayskull is a fictional castle that forms a central location in the Masters of the Universe toy/comic/animation universe and also appears in the 1987 live action adaptation. The concept is credited to Donald F. Glut. The toy set was invented by Roger Sweet. Castle Grayskull was a "major feature of Mattel's line", and was "one of the most famous playsets of all time".

In the storyline of the franchise, it is the target of numerous attacks by Skeletor, Hordak and the Snake Men, all of whom believe that the secrets inside will allow them to conquer Eternia and the entire universe, and become the titular Masters of the Universe. Castle Grayskull plays a key role in the transformations of both He-Man and his twin sister She-Ra in the 1983–1985 He-Man and the Masters of the Universe series, and in its 1985–1987 spinoff/sister series She-Ra: Princess of Power.