In the She-Ra and the Princesses of Power Season 4 trailer, the Princesses uncover mole in their midst.

Even as the Princess Alliance celebrates the crowning of Queen Glimmer, war brews in Etheria. Soon, it becomes evident that the Horde knows their every move -- which means a traitor lurks among them. Considering the arrival of shape-shifting mercenary Double Trouble, the Princesses might be in more trouble than they realize, and not even Adora's alter ego She-Ra can fix it.

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According to the official Season 4 synopsis,

She-Ra and the Princesses of Power Season 4 begins with the respective rises of Queen Glimmer as leader of the Rebellion and Catra as co-leader of the Horde. As the Horde makes advances on the Rebellion under the looming threat of Horde Prime’s arrival, the Princess Alliance makes heroic strides but begins to disagree on the best way to defend Etheria. Ultimately, a shocking discovery about Etheria itself causes Adora to reconsider everything she thought she knew.

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Streaming now on Netflix, She-Ra and the Princesses of Power stars Aimee Carrero, Karen Fukuhara, AJ Michalka, Marcus Scribner, Reshma Shetty, Lorraine Toussaint, Keston John, Lauren Ash, Christine Woods, Genesis Rodriguez, Jordan Fisher, Vella Lovell, Merit Leighton, Sandra Oh, Krystal Joy Brown and Jacob Tobia. Season 4 debuts on Nov. 5.