Thora is an evil witch appearing in the comic book series Grimm Fairy Tales Presents: Oz as well as its prequel Tales from Oz and the sequel Warlord of Oz.
In Oz, she is an apprentice of Lynessa, the Wicked Witch of the West.
In the prequel, it revealed how Lynessa healed but corrupted Thora. Lynessa also cursed her lover Woodsman into the Tin Man out of jealously for Thora's affection.
In the sequel, Thora is eventually betrayed and killed by Lynessa's mother, the Arch-Witch Zamora. After Thora succeeds in resurrecting Zamora, she is killed by her so Zamora can take her youth.