Codominance
Theo and his Pack start tracking down Deucalion, which Scott finds out through Mason, via Corey.
Scott finds Deucalion first and puts two and two together that Theo wants to learn from Deucalion how to steal the power from the Beast of Gevaudan. To repay Scott for sparing him months last year, the True Alpha alerts the Deucalion of this, then enlists him to undermine Theo. Deucalion accepts and presents himself to be blind again+ .
The Sword and the Spirit
Theo's Pack, Tracy, Corey and Josh find Deucalion and after great strife and pain on their part, they bring him to the The Dread Doctors' operating theatre. Deucalion is hooked up to a contraption injecting the trapped Alpha with wolfsbane to weaken him.

The blind Alpha tells Theo he knows about the resurrected Beast of Gevaudan and that he wants Deucalion will show him how to steal its power. Theo, pleased, thinks Deucalion wants to make a deal. He invites the trapped Alpha to just tell him what he wants.
Deucalion: "I want his eyes. On the tips of my claws. I want the eyes of Scott McCall."
Amplification
Lie Ability
The Beast of Beacon Hills