An ex-tunnel dweller seeks to avenge his father's death and targets Father.

Diana stalks a serial killer of ex-tunnel dwellers; Father reunites with a former love (Fionnula Flanagan).

Vincent destroys a drug warehouse after an addicted ex-prodigy returns with a gunshot wound.

Diana and Joe help Father and other tunnel dwellers rally to rescue Vincent from Gabriel.

Vincent surrenders to Gabriel after Catherine's son falls ill. Directed by Ron Perlman.

Diana takes Vincent to her apartment to recover from the explosion that nearly killed him.

Vincent passes Snow's ring to Burch who then makes an unholy deal with Gabriel.

As Vincent recuperates, Gabriel hires an assassin to track down Moreno's killer.

Vincent and Burch join forces to capture Catherine's killer.

Grieving Vincent retreats to a deep cavern; Detective Diana Bennett (Jo Anderson) probes Catherine's death.