A bit of the Supernatural is coming to Ringer (and we don't mean finding out Siobhan is really a zombie).
Misha Collins, who played the angel Castiel on Supernatural, has signed up for a guest starring appearance in episode 14, according to TV Guide.
His character, Dylan, has ties to both Bridget Kelly and Siobhan Martin (Sarah Michelle Gellar) from their days in the Lake Tahoe area. And he has something to do with the incident that tore the sisters apart.
Source: TV Guide