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|image= [[File:SN920-0018.jpg|300px350px]]

|outline= [[Sam]] and [[Dean]] cross paths with [[Ennis Ross]], who witness his girlfriend murdered by an apparent [[monster]]. Together they learn about the unknown monster underbelly that is secretly running Chicago.

[[Ennis Ross ]] is taking his girlfriend [[Tamara ]] to upmarket restaurant "Il Secundo,", with the intent of proposing to her. As he speaks with Maurice the maitre d' about hiding the engagement ring in a glass of champagne, they are interrupted by [[Sal Lassiter]]. The matire d' ignores Ennis to accompany Sal to the private club in the back, and as they leave Ennis catches a glimpse of the bodyguard Marv's face in the mirror where his reflection is grotesque.

The private club is full of [[monsters ]] of different types socialisingsocializing. At the bar Sal -- a [[shapeshifter ]] -- is approached by [[werewolf ]] [[Julian Duval]], who isn't pleased to see him. They get into a fight, but their bodyguards pull them apart, and David leaves. Soon after a masked figure, with what looks like [[silver ]] claws arrives and starts killing.

Sal is injured and staggers outside tot he pier where Ennis is about to propose to Tamara. The creature follows, and as it attacks Sal, it pushes Tamara out of the way. She falls, hitting her head and dies. The creature rips out Sal's heart and flees. As Sal lays dying he says to Ennis , "David - i , I had no choice."

Later at the police station Ennis tries to explain to [[Detective Freddie Costa ]] what he saw , but the detective, despite being a friend of Ennis' late father , who was also on the force, doesn't believe him. Sam and Dean arrive pretending to be FBI agents. They listen to Ennis' story and then leave, warning him that monsters aren't real.

At the Lassiter home, eldest daughter [[Margo Lassiter|Margo]] is consulting with Detective Costa, who is on the Lassiter payroll. He tells her that the [[ghoul ]] family may not support the Lassiters if she moves against the Duvals. He points out that the other four monster families are looking to take more power now that Margo's father is dying.

[[David Lassiter]], youngest son of the Lassiter family, returns home for the first time in three years after Margo calls to tell him that Sal has been killed. David finds Margo's henchmen preparing a cache of weapons. She is blaming that Julian Duval for Sal's death and wants war. David is shocked out how his father's health has deteriorated since he has been away, and he advises Margo against war with the Duvals. Margo mocks him, accusing him of supporting the Duval's because he used to date [[Violet Duval]]. She takes delight in telling him that Violet is being married off to a New York werewolf family to forge an alliance.

Julian Duval is meeting with one of the Djinn [[djinn]] family, and they discuss how the Lassiters may respond to Sal's death. Violet interrupts, demanding to know if it was Julian who killed Sal. He denies it, and says he doesn't care as long as it brings on a war with the shifters. He reminds her she has no power in the family.

At home, Ennis pulls out a trunk of his fathers. He takes out a revolver, and finds, hidden in the box a collection of silver, engraved bullets. He returns to the club behind the restaurant and is confronted by the maitre d'- who is a [[vampire]]. Ennis shoots him to no avail. Dean comes up behind the vampire and decapitates it with a machete.

Sam gives Ennis a quick run down on the fact that monsters exists, while Dean discovers stores of blood and flesh behind the bar. The Winchesters theorises theorizes that maybe Sal Lassiter was a monster of some sort and plan to head to the morgue to check it out. Ennis insists on accompanying them but they warn him off getting involved.

Returning home, Ennis starts researching Sal Lassiter online, when Freddie Coasta knocks at the front door. He comes in and starts asking the same questions he had the night before. Suspicious he manages to sneak a picture of Freddie, and he notices his eyes flare in the photo, which Sam and Dean told him was a sign of a shapeshifter. He asks if Freddie wants to wait until Ennis'dad nate [[Nate Ross|Nate]] gets him, and he agrees. This confirms Ennis' suspicions as the real Costa know that his father is dead.

In an abandoned building, Violet is bound, her captor -- a human called named [[Irv Sokolowski]] --explains that Sal and a group of monsters killed his young son. He is trying to make the different families go to war against each other in revenge. Meanwhile, Sam and Ennis, and Dean and David, have tracked Violets GPS signal to the building. As they search it, Ennis tells David what Sal said as he died.

Sam and Dean reluctantly leave Ennis after getting a call from Cas [[Castiel]] that he has found [[Metatron]]. They warn Ennis to stay away from the monsters, and advise that they will send some hunters to clean things up.

* [[Nate RossTamara (Bloodlines)|Tamara]]

This episode is also a backdoor pilot for ''[[:Category:Bloodlines|Supernatural: Bloodlines]]'', a series set in Chicago and based on the characters introduced in this episode. }}{{TriviaQuote |Text= [https://storify.com/superwiki/supernatural-bloodlines-tweets Tweets from the cast and crew] during the episode broadcast.

:''[http://en.wikipedia.org/wiki/Transformers Transformers] are a line of toys/TV series/films that revolve around robots that can transform into automobiles, among other things.''