A great sadness fell upon the Kingdom of Eternia at the loss of the Princess. The Sorceress used the magic of Grayskull to remove the memories of the Princess from the minds of all Eternians. Only Randor, Marlena, Man-At-Arms and the Sorceress retained their memories.
Adora was raised under the care of a Horde servant called Shakra, who was able to provide Adora with some goodness during her early life. They developed a strong relationship during Adora's life with the Horde. The strength of their relationship is evidenced in the second season of She-Ra's series by Shakra's decision to also leave the Horde and join the Great Rebellion.
When Adora was old enough to begin to serve the Horde, Hordak had Shadow Weaver put Adora under a spell so that she would follow the Horde and not question their ruling methods. Hordak saw great potential in Adora and made her the Force Captain of The Horde.
The planet they travel to is called Etheria. Adam and Cringer travel to the village of Thaymor. At the inn they stop for lunch, but Horde Troopers enter and cause trouble. Adam confronts them, Bow joins him and they beat the Troopers. Adam and Bow return to The Whispering Woods, and Bow says that Adam is an ally to The Great Rebellion. Later when Adam tells The Rebellion that they should fight The Horde, they head off to the Fright Zone. The rebels begin their fight with The Horde, and appear to be near to defeat, until He-Man arrives. Adora flees and He-Man follows her. He confronts her in a room with the sword the Sorceress gave him. The sword begins to glow, and He-Man realizes that the sword is meant for her. He is then knocked out by a Horde laser and Adora picks up the sword and He-Man is taken to the Horde prison on Beast Island.
Adora visits He-Man in his prison cell and tells him that she feels drawn to the sword, as if it were made especially for her. He-Man confirms this, but tells her it is for a person who fights on the side of good. Adora responds by telling him that she serves The Horde, the lawful rulers of Etheria. He tells her she is wrong and to go and discover for herself the evil acts that are being carried out against the innocent people of Etheria. She tells him he is mistaken and she leaves the island with Spirit to prove him wrong. While riding through the villages of Etheria, Adora discovers that He-Man is correct and that The Horde rule with brutal tyranny. Meanwhile Kowl comes to rescue He-Man from his cell. Adora rides back to the Fright Zone, where she challenges Hordak and Shadow Weaver with the truth. She tells them she has seen for herself that The Horde are cruel rulers. Shadow Weaver discovers that the sword Adora is carrying is somehow weakening her own magic. She puts Adora into a magic-induced stupor and takes the sword.
Adora awakens from her slumber without the memories of the previous day's events. Later that day, she and The Horde capture rebels and place them in a glass chamber which will drain their energy to power Hordak's new invention. He-Man sneaks into the Fright Zone disguised as a Horde Trooper. When he asks her if she now knew the truth about The Horde she arrests him and Hordak takes him to drain his energy. Adora expresses her dislike of this, but Shadow Weaver uses her magic once again. Later that night an echoing voice wakes Adora, once more she silently walks into the room where He-Man is being drained of his energy. She is drawn to the sword again. The face of a woman appears in the jewel embedded in the sword. The woman is the Sorceress. She reveals to Adora that she was kidnapped by The Horde when she was a baby and that she had a twin brother. When it is revealed that He-Man is her twin brother she is amazed. The Sorceress tells her "For the honor of Grayskull", then her image vanishes from the stone. Adora lifts up the sword and repeats the Sorceress' last words, in a swirl of lights and magic she is transformed into She-Ra. She releases He-Man from his chains and gives his sword back to him. With the sword in his possession again his energy is restored by the sword's magic, while He-Man battles the Troopers She-Ra jumps from a window and crashes into the Horde stables and lands atop Spirit. The magic that transformed Adora also changes Spirit into Swift Wind, a winged talking unicorn. They fly ahead to warn The Rebellion. He-Man fights Hordak and She-Ra comes to help. Both safe, She-Ra tells a stunned He-Man that she is his sister.