Chi (The Battle)
From Tardis Wiki, the free Doctor Who reference
Chi (The Battle) was an archivist, Zara needed her help. She would have disappeared if Zara didn't appear. She asked Zara about the new histories they created. She helped create a tapestry. She told the sisters that they will meet Marek again. (AUDIO: The Battle) Abby and Zara asked her if she had any information to save Wing. (AUDIO: Consequences)