Episode 62 of "Angel"
s03e18 Double or Nothing

A deal Gunn made years ago where he offered his soul in trade comes back to haunt him in the form of a demon who comes to collect. Making matters worse, the demon wants to hold Fred until Gunn makes good on his deal. Cordelia finally returns with Groo and she does her best to offer sympathy to Angel, who's still unable to come to grips with the loss of Connor. Wesley, who survived, finds himself on his own in light of his actions that cost Angel his son.