I've never been with a man before either...
―Colleen in Xander Harris' dream[src]

Colleen (last name unknown) was a Potential Slayer and, presumably, also one of the new Slayers. At some point after she had arrived she met Xander Harris. One night, he had a dream about her and her fellow potential slayer Caridad in a threesome.

Behind the Scenes

  • According to the commentary on the episode "Dirty Girls", Colleen was named after a member of writer Drew Goddard's family.
  • She is presumed participating at the Battle at the Hellmouth and survived.