'Teen Wolf' Season 3 Spoilers: Episode 12 "Lunar Ellipse" Trailer / Scott and Deucalion VS Jennifer in Mid Season Finale at 10 PM ET on MTV [TRAILER]

The final battle starts right now! The summer finale of Teen Wolf Season 3 premiere this Monday at 10/9c on MTV.

There will be blood. Check out the Season 3 finale trailer above for a sneak peak into Episode 12: "Lunar Ellipse"

In the trailer Jennifer tells Lydia to scream. Is she going to kill her?

The clip then moves through scenes with other cast members. It switches to a scene with the gang debating their next move. Isaac, always the skeptic asks Scott: "The guy call himself Death, Destroyer of Worlds, we're going to trust that guy?"

Skeptic or not, Isaac does have a point.

Also in the trailer we know, to combat Jennifer, Scott and Deucalion will have to team up. Though Scott is a little apprehensive about taking on such evil, just the two of them, Deucalion seems confident that the pair will make a good team. What is Deucalion planning? Does he have something up his sleeve? Will this be the final bid to lure Scott into his pack?

Near the end of the trailer promo we hear Deucalion's Demon Wolf voice summoning Scott to battle and urging him to transform into the Alpha he was meant to be. The trailer ends with a red-eyed Scott. Does he follow Deucalion's orders?

Either way the final episode before the summer finale is shaping up to be quite the battle royale.

Tune in for Teen Wolf Season 3 Episode 12 "Lunar Ellipse" which airs Monday night at 10 PM ET on MTV.