Castle Grayskull is a fictional fortress from the He-Man and the Masters of the Universe franchise. It serves as the home of He-Man and is known for its distinctive skull-like appearance. The castle is a source of great power and is often sought after by various characters in the series. Inside Castle Grayskull, there are many secrets and magical artifacts. The castle is protected by the Sorceress, who helps guide He-Man and his allies in their battles against evil forces, such as Skeletor. Its iconic design and role in the storyline make it a central element of the franchise.