From thewb.com
The gang starts to have doubts about Angel's (David Boreanaz) loyalties when he appears to have become very close with the Circle of the Black Thorn, an evil secret demon society. When Drogyn (guest star Alec Newman), the guardian of the deep well, makes a startling revelation, the gangs' fears that Angel has become evil seem to be validated.
Alexis Denisof, J. August Richards, Amy Acker, James Marsters, Andy Hallett and Mercedes McNab also star. Christian Kane makes a guest-starring appearance as Lindsay. James A. Contner directed the episode written by David Fury.