She-Ra Unchained is a first season episode of the animated television series She-Ra Princess of Power, produced in 1985. Written by Larry DiTillio, directed by Gwen Wetzler.
Within the Fright Zone, Hordak introduces his latest invention, the Magnabeam, which can transport objects from one place to another. He plans to use the Magnabeam on the Whispering Woods, transporting the entire forest to the Valley of Lost, from which no one has ever returned. Hordak takes Mantenna, Adora, and Shadow Weaver to the Plunder Room, where rebels are drained of their willpower and that life force is used to power the Magnabeam. Adora, still under Shadow Weaver's magic, looks slightly concerned when she sees a defiant rebel about to placed in the booth. Hordak is more concerned that the rebels in the Horde dungeons provide little energy for the machine and commands that more rebels be captured.
Meanwhile, in the Whispering Woods, Glimmer and Bow try to discourage Adam from journeying into the Fright Zone. After winning the argument, Adam sets off and immediately locates a group of marching Horde Troopers. Transforming into He-Man, he captures one of the Troopers and dons their armor, in order to sneak unnoticed into the Fright Zone.
Shadow Weaver reminds Hordak that the returning Troopers may have captured some rebels. Her magic allows them to see the Troopers, and they notice that one Trooper is different from the others, concluding that it is He-Man in disguise. Once inside the Fright Zone, He-Man confronts Adora, hoping that she has learnt the truth about the Horde. Shadow Weaver's spell over Adora proves more powerful than the truth, and she arrests He-Man as Hordak arrives. He-Man is overpowered and Hordak suggests using him to charge the Magnabeam; Adora is horrified, until Shadow Weaver induces her spell of control once again.
Shadow Weaver, now in possession of both He-Man's Sword of Power and the sword that Adora was holding, attempts to understand the nature of the swords' power, but can make no sense of them. Adora is awakened in the night by a strange voice; she goes to the Plunder Room to find He-Man's energy being drained. The sword grabs her attention; the Sorceress appears in the jewel, telling Adora to throw off the spell. She reveals that the Horde stole Adora from her parents as a baby, and that she had a twin brother. Adora is stunned when the Sorceress tells her that He-Man is indeed her twin brother. "For the honor of Grayskull," says the Sorceress, before He-Man is completely drained of his energy and collapses.
Adora raises the sword, repeating the final words spoken to her by the Sorceress, and transforms into She-Ra. The Princess of Power frees He-Man from his imprisonment and returns his sword to him. The power of Grayskull revives He-Man, even as Hordak enters the room with more Horde Troopers. While He-Man fends off the Troopers, She-Ra leaps out of the window and crashes into the stable, landing on her horse, Spirit, who transforms into Swift Wind the unicorn. They fly out to warn the Great Rebellion, while He-Man jumps up into the top level of the Fright Zone to stop Hordak.
The Horde leader unleashes a blast from the Magnabeam, which a returning She-Ra stops with a boulder; He-Man destroys the Magnabeam before Hordak can get a second shot. She-Ra and Swift Wind rescue He-Man, who is astounded when She-Ra reveals that she is his sister.