Buffy

Maybe this will help the weak ratings: Sarah Michelle Gellar will reunite with one of her Buffy the Vampire Slayer co-stars on Ringer.

Amber Benson will guest-star in Episode 10 of the freshman series, TVGuide.com has learned exclusively. Benson, who portrayed Willow's girlfriend Tara Maclay on Buffy, will play Mary Curtis, a stripper who is also an informant for Agent Machado (Nestor Carbonell).

Buffy the Vampire Slayer: Then and now

Last seen taking a bullet aimed for Buffy in Season 6, Benson has gone on to appear in several TV series, including Grey's Anatomy, Private Practice and Supernatural.

Ringer airs Tuesdays at 9/8c on the CW.