On this episode of Supernatural…

Sam and Dean travel to Chicago and discover that it is run by various monster families.

Ennis, a young man whose girlfriend is murdered by a mysterious killer, is thrust into the monster world and guided by Sam and Dean into taking down the killer.

David, a shapeshifter from a powerful family who is in love with a werewolf, tries to rescue his love and teams up with Sam, Dean and Ennis.

The killer is merely a human trying to get the monsters to fight each other. Ennis kills him.

A war looms over the families as they vie for power.

Sam and Dean leave after getting news about Metatron.

Ennis receives a call from his presumed dead father.