Illyria is a powerful ancient being who has been injured by Hamilton, an agent of the Circle of the Black Thorn.

The Circle of the Black Thorn is a secret society that serves as the instrument of the Senior Partners of Wolfram & Hart, involved in dark and apocalyptic activities.

Angel infiltrates the Circle, pretending to align with them while secretly planning their assassination to thwart their apocalyptic goals.

The Shanshu Prophecy foretells that a vampire with a soul will play a pivotal role in the apocalypse and may become human as a reward.

Angel signs away his potential humanity to prove his loyalty to the Circle and to further his covert plan to destroy them.

Wesley, grieving for Fred, rejects Illyria's offer to take Fred's form, showing his desire for truth and acceptance of loss.

Angel's plan involves each team member assassinating a specific member of the Circle to weaken their influence and stop their apocalyptic plans.

Lindsey agrees to join Angel's fight against evil, despite their past conflicts, acknowledging the need to combat greater threats.

Wesley is mortally wounded by Vail, a sorcerer from the Circle, and dies after a final encounter with Illyria posing as Fred.

Lorne kills Lindsey, following Angel's orders, as Lindsey is seen as untrustworthy and a potential threat.

Angel defeats Hamilton in a fierce fight, demonstrating his determination and strength against the forces of evil.

The final scene shows Angel and his remaining team preparing to face a massive army of demons in an alley, symbolizing their unending fight against evil.