After dealing with vampires in the previous episode, Sam (Jared Padalecki) and Dean Winchester (Jensen Ackles) will continue to deal with other creatures in the next episode of "Supernatural" Season 9. The CW Network has released a promo video for Episode 20 titled "Bloodlines" which is the backdoor pilot episode for the CW's potential spinoff series and the preview teases about the mafia-like monster families ruling Chicago.

Credit: YouTube/The CW Television Network

In the promo video released, the Winchester hunters will be heading to Chicago to investigate a case that will reveal the existence of shapeshifters and werewolves in the city unknown to the human beings. Sam and Dean can be seen in the preview meeting and interrogating Ennis (Lucien Laviscount), a man who wants to seek revenge for the murder of his fiancée, about the five monster families that run Chicago.

Ennis obviously wants to personally bring justice to his fiancée's death by getting into the lifestyle of a hunter but Sam warns him that it may not be a good idea for the newbie. "What we do, its' dangerous," Sam stated and Ennis simply pointed out that he knows the city and the Winchester brothers do not. "What is this? The Godfather with fangs?" Dean stated in the ending of the promo video.

According to the Examiner report, Margo Lassiter (Danielle Savre) leads the family of shapeshifsters while Julian Duval (Sean Faris) leads the werewolves. The twist to the story comes when Margo's brother, David (Nathaniel Buzolic) returns and her leadership got thrown into question. Click HERE to see the image stills for "Supernatural" Season 9, Episode 20.

The official synopsis for "Bloodlines" in the Hypable report reads: "SAM AND DEAN INVESTIGATE MONSTER FAMILIES IN CHICAGO - Sam (Jared Padalecki) and Dean (Jensen Ackles) investigate a case in Chicago, where they discover that various mafia-esque monster families are, unknown to humans, running the underbelly of Chicago. One is a family of shapeshifters run by Margo Lassiter (guest stars Danielle Savre), whose leadership is thrown into question when her brother David (guest star Nathaniel Buzolic) returns home. The other reigning family in town is made up of werewolves, lead by Julian Duval (guest star Sean Faris). While in Chicago, Sam and Dean meet Ennis (guest star Lucien Laviscount), a man with a personal vendetta against the monsters. The Winchesters warn Ennis about heading into the hunter lifestyle, but Ennis refuses to listen and starts down a dangerous path."

"Supernatural" Season 9, Episode 20 titled "Bloodlines" is scheduled to air on Tuesday night, April 29, at 9 pm ET on the CW Network.

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