She-Ra and the Princesses of Power

The series follows Adora, an orphan raised by Hordak, the tyrant who rules the planet Etheria through his evil Horde. One day, after getting lost in the woods, Adora finds a magic sword that transforms her into the Princess of Power, She-Ra. Realizing the suffering that the Horde has inflicted on the planet and its people, Adora joins a resistance group of other magical girls, the Princess Alliance, in order to liberate Etheria from Hordak's grasp. This pits her against her former comrade Catra.

(Source: Wikipedia)