Cora Hale is a character in Season 3 of the supernatural drama Teen Wolf and is played by Australian actress Adelaide Kane. The character is listed simply as “Cora” in all official source material. She is Derek Hale’s younger sister and is a werewolf. Derek was surprised that she had survived the Hale House fire that claimed most of their family. In Riddled, Derek reveals that Cora was in South America during her six year absence and is currently back there.