He-Man and She-Ra: The Secret of the Sword was produced by Filmation. Although released before the series She-Ra: Princess of Power began, the film was a compilation of the first five episodes with minor edits made.
The Sorceress sends Prince Adam to the world of Etheria. Adam is to give a very special sword to someone who lives there. But when Adam discovers that Etheria is ruled by an intergalactic army known as the Horde, he becomes He-Man to help a band of rebels fight the Horde.
During the battle, He-Man is captured by the Horde’s Force Captain Adora and taken as a prisoner. Disturbed from her sleep, Adora is contacted by the Sorceress through the jewel in the sword that He-Man was sent to give to her. The Sorceress tells her that she is meant for a special destiny and also reveals to her the awful truth behind her past. She reveals to Adora that not only is she a princess kidnapped by the Horde when she was a baby, but also that He-Man is really her twin brother.
Eager to save He-Man, Adora uses the sword to become She-Ra, Princess of Power. As She-Ra, she sets He-Man free and helps him escape from the Horde with the aid of her beloved companion, Swift Wind. Reunited at last, He-Man and She-Ra set out to reunite the royal family of Eternia and free Etheria from the Horde’s tyranny.