|Episode(s)||15.15 Gimme Shelter|
Zack is a Crossroads Demon. He affects an English accent because he thinks it's classy.
Zack is summoned by Castiel, who wishes to find out if demons are involved in a series of murders. Zack tells Cas and Jack that he is bored because Rowena has disallowed demons to make deals with humans, believing that "people end up where they belong". He is intrigued that Cas and Jack are investigating human murders and begs to come along, but they don't invite him. At the end of the episode, Zack is seen driving the police car that takes Sylvia away.