Kate's father, Trevor Lockley, gets involved in a demon drug smuggling operation and he's soon in over his head. When a demon high on drugs attacks the subway, Angel begins investigating and quickly discovers Trevor's shady dealings. He tries to warn Trevor, but it's too late. When Trevor is attacked, Kate blames Angel for not doing more. Meanwhile, through flash backs, Angel's own father is introduced, Angel's past as a human is shown and Angelus is born.
Did You Know?
Since Angel's real name is Liam, which is Irish for William, and Spike was known as William the Bloody, they essentially have the same name. This was intended by Joss Whedon and the other writers. James Marsters, who played Spike, can be found in many YouTube interviews and conversations with fans at conventions saying that Angel was the right boyfriend for Buffy, and that Spike was the bad boy, and therefore the bad boyfriend for Buffy. See more
Wesley claims to be doing a vivisection on the remains of a demon. However, a vivisection is only done on living specimens. What Wesley has done would be more aptly described as an autopsy, or a post mortem. See more
[about his sister
She thought I returned to her - an angel.