It all begins when The Sorceress, who dwells in the mysterious and magical Castle Grayskull calls on Adam, Prince of Eternia. She presents Adam with a powerful and magical sword, which he must learn to use with great wisdom and knowledge. The sword enables Adam to transform himself into He-man, the most powerful man in the Universe, by holding aloft his magic sword and commanding "By the power of Grayskull! I have the power!" The sword also transforms his trusted but fearful feline friend Cringer, into the fierce and loyal sidekick, Battlecat.