Angel, Season 4

Jasmine:
Yes. In the beginning, before the time of man, great beings walked the earth. Untold power emanated from all quarters-the seeds of what would come to be known as good and evil. But the shadows stretched and became darkness, and the malevolent among us grew stronger. The earth became a demon realm. Those of us who had the will to resist left this place, but we remained ever-watchful.