Guinevere Winchester

Guinevere Winchester, also known as simply Guin, was a companion of the Doctor. (ST: Revenants)

Behind the scenes

 * Little is known about the Doctor to whom she was a companion — other than that he had red hair. He is assumed to be a future incarnation, rather than one from an alternate dimension.
 * Because her story appears in a piece of licensed fiction and is not explicitly stated to be outside the normal DWU, she's assumed to be a genuine part of the DWU.