Disclaimer: I don't own BTVS or Charlie's Angels. Charlie's Angels is a 2000 American action comedy film directed by McG, starring Cameron Diaz, Drew Barrymore, and Lucy Liu as three women working for a private investigation agency. The film is based on the television series of the same name from the late 1970s, which was adapted by screenwriters Ryan Rowe, Ed Solomon, and John August. Buffy belongs to Whedon.
A guy named Charlie gave Faith a get out of jail free card, the rest is Angel history.