Luna is the Weird Sister of Fate.
She can be distinguished from the others by her silver/white hair. Luna is the most mystical of the three. She foretold of the Magus's death while she and her sisters fought with him. ("Avalon" Part Three)
When Luna is ascendant, the Sisters are the Fates or Norns. 
- "City of Stone Part One" (First Appearance)
- "City of Stone Part Two"
- "City of Stone Part Three"
- "City of Stone Part Four"
- "High Noon"
- "The Price" (Weird Sisters Mentioned Only)
- "Avalon Part One"
- "Avalon Part Two"
- "Avalon Part Three"
- "Sanctuary" (Weird Sisters Mentioned Only)
- "Ill Met By Moonlight"
- "The Gathering Part One"
Real World Background
Luna is the Latin name for the moon, and also the name of the goddess of the moon in Roman mythology.
For the Fates, see the article on the Weird Sisters.
Voice Actor: Kath Soucie