By the time the animated series was developed, He-Man's origins had been revised as follows: his true identity is Prince Adam of Eternia, son of King Randor and Queen Marlena, an earthling, who rule the Kingdom of Eternia on the planet of the same name. The Sorceress of Castle Grayskull endows Prince Adam with the power to transform into He-Man, which Adam does by raising his Power Sword and proclaiming: "By the power of Grayskull." Once the transformation is complete, he continues "I have the power!" The differences from Prince Adam and He-Man are minimal, He-Man possessing a slightly deeper voice, and with slightly darker skin and hair.
Prince Adam's pet is a cowardly green tiger named Cringer. When Adam becomes He-Man, he similarly transforms Cringer into a brave armored green tiger named Battle Cat by pointing his sword at him - an ability Adam discovered accidentally the first time he turned into He-Man; Cringer, naturally, cowered in fear at seeing what Adam had become and while reassuring him that nothing had really changed, Adam pointed the sword at Cringer, which sent a bolt of energy toward the tiger and transformed him. Battle Cat has served as He-Man's steed and fierce fighting companion ever since.
Adam is friendly with the beautiful and strong-willed Teela, who, unbeknownst to her, is the daughter of the Sorceress. Teela was adopted by Prince Adam's mentor, Man-At-Arms (proper name Duncan). Adam and Teela grew up together, and now, as Captain of the Guard, Teela is entrusted to protect the prince. She often sees Adam as lazy and cowardly because she is unaware of his alternate identity as He-Man.
Man-At-Arms is He-Man's closest companion and the Eternian royal family's innovator of technology and weapons. In many episodes, Man-At-Arms unveils new and fantastic weapons or devices that help He-Man and his friends.
Prince Adam
Castle Grayskull is the source of He-Man's powers. Inside the Castle lives the Sorceress, who grants Prince Adam his transformative abilities, and communicates telepathically with He-Man.
To protect his family, He-Man keeps his double identity secret, sharing the knowledge only with Orko, Man-At-Arms, Cringer/Battle Cat and the Sorceress.