Cassidy has mostly been a mystery in Preacher so far. 1 / 7
As has the race of vampires in general. 2 / 7
However, season 4 finally delved into Cassidy's backstory. 3 / 7
Fighting the Irish Republic in 1916, Cassidy leaves his friend to die. 4 / 7
On the run, Cassidy gets stuck in a swamp and attacked by a vampire. 5 / 7
This is mostly the same as Cassidy's origin in the comic books. 6 / 7
And provides a reason for the character's self-destructive behavior. 7 / 7