A version of Narvin from an alternate timeline regenerated into a woman.

Biography

One of the alternate versions of Narvin, created by a temporal shockwave caused by the War Master, had an incumbent regeneration into a woman. (AUDIO:Shockwave)

Encountering the Unbound Master

When the Unbound Master was visiting the alternate versions of Gallfrey, he encountered Narvin and her version of Gallifrey. (AUDIO: Shockwave)