In the Shadows of Mystacor is the seventh episode of She-Ra and the Princesses of Power. It was released on Netflix with the rest of the first season on November 13, 2018.
Adora needs rest and keeps having nightmares involving Shadow Weaver. Glimmer takes her to the hidden kingdom of Mystacor which is ruled by her aunt, Castaspella. While Adora tries to relax, she keeps believing that Shadow Weaver is in the kingdom which everyone tells her is impossible. As a ceremony to renew Mystacor's power draws near, Shadow Weaver enacts a plan by using one of her shadow spies to steal the power but is defeated by She-Ra.
- Aimee Carrero as Adora/She-Ra
- Karen Fukuhara as Glimmer
- AJ Michalka as Catra
- Marcus Scribner as Bow
- Sandra Oh as Castaspella
- Keston John as Hordak
- Lorraine Toussaint as Shadow Weaver
- The history between Castaspella and Shadow Weaver was part of their back story in the original She-Ra: Princess of Power series. However, the name 'Light Spinner' was only used in the UK Masters of the Universe and Princess of Power comic magazines. The Masters of the Universe Classics line which began in 2008 elaborated on Shadow Weaver's origin by by revealing her true name to be Beatrix, with Light Spinner being a pseudonym she used while studying under the wizard Norwyn with Castaspella.
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