When we meet up with Constantine he's voluntarily checked himself into an asylum. Due to a tragic incident he has sworn off investigating the supernatural.
Based on the popular DC Comics series Hellblazer, Constantine will travel the country seeking out supernatural terrors and sending them back where they belong.
The cast of NBC's Constantine. (Left to right) Harold Perrineau as Manny, Matt Ryan as John Constantine, Angelica Celaya as Zed, Charles Halford as Chaz