Sean McLoughlin is a half angel trainee in the Demon Patrol Unit(DPU). His father is the right hand of God, and his mother was killed when Sean was 4. Sean, nicknamed Jack, swore that he would avenge his mother's death by any means necessary. Mark Fischbach is the son of the Devil himself. He is ruthless, and known for killing the best demon hunters in the world. Mark is the leader of the HEP, or the Human Extermination Program. He wants to rid the world of humans, and nothing will stand in his way.