After losing his grace in the previous season, Jack starts as a human teenager learning the ropes of hunting.
In a moment of unintentional rage, a soulless Jack kills Mary Winchester , a seismic event that shatters the family and sets Dean on a path to destroy Jack. Key Storylines and Villains Supernatural Season 14 Complete Pack
To save his life and eventually defeat the archangel Michael, Jack uses powerful "soul magic" that gradually burns away his soul, leaving him increasingly detached and dangerous. After losing his grace in the previous season,