Bill Paxton Bill Paxton

Agent Coulson and his ragtag team will have their work cut out for them in the season finale of Agents of S.H.I.E.L.D. on Tuesday (8/7c, ABC).

Now that Garrett (Bill Paxton), who was actually patient zero in the Deathlok program, has taken the GH325 serum, it seems like he'll be unstoppable. But will he actually be stable? Let's not forget, Project T.A.H.I.T.I. has yet to work on anyone but Coulson (Clark Gregg). How will that affect Garrett's plans? And will Coulson exploit that potential weakness to take Garrett down? caught up with Paxton to get the scoop:

Exclusive Agents of S.H.I.E.L.D. Sneak Peek: Watch the first minute of the finale!

Did you know when you were first cast that you'd end up being the big villain?
Bill Paxton:
I had a feeling. I knew I was the Clairvoyant and that I was ultimately with Hydra, and I knew that my character needed the serum because he was dealing with his own mortality issues, but everything was strengthened and deepened as the character started to really come alive on the show. They started writing for the character more specifically. I've had a ball. Something really fun about this show, and particularly with this character, is that it's very freeing. You can have some fun with it and you can be a bit campy.  

How will getting the injection change Garrett?
It changes everything. It changes his whole outlook. It brings him back to life, first and foremost, but he almost becomes a super Id. He's starting to see the really big picture, even all the way back to the Big Bang. He's on fire.

Coulson has said before that Project T.A.H.I.T.I. didn't work on certain people because it caused them to go a little deranged. Might that be the case with Garrett, who is already a psychopath?
He's definitely a psychopath. It's very empowering. I kept thinking about Alastair Sim's performance in the great black and white version of A Christmas Carol after he's been visited by the ghosts of Christmas Past, Present and Future and he says, "I'm as giddy as a schoolboy." There's something that's flowing out of him that's very disconcerting to those around him. He's saying to them that he hasn't lost his senses, he's come to them! It was a lot of fun. That's a fun energy to bring onto the set to play. It's also dangerous and scary when you think of the character of John Garrett and where he's coming from.

Add new fall shows to your Watchlist!

Ward (Brett Dalton) has followed Garrett all this time, but how will he feel about Garrett's change?
He's torn because you have to remember that this is a father-son relationship even though it's a surrogate father-son relationship. What was so great and what I loved about the last episode was doing that character stuff and learning how from adolescence Garrett had come into this boy's life and really taken over everything. He told him how to think, he told him his politics and was very charismatic in a way that he fell into it. He was almost the kid's savior, which is what he planned to be. But Garrett has really manipulated this boy's mind and his emotions. I hope it gives the Ward character a chance at redemption because his actions haven't been completely his own when you see how he was raised. It's almost like an abused child who committed an atrocity and put on trial. When the judge finds out this is what happened to this guy and what put him in this position in the first place, you tend to want to lean towards some kind of leniency because these are what you call extenuating circumstances.

On the flip side of that, Raina (Ruth Negga) has been interested in the science side of everything, so is it safe to assume that she's excited over this new development with him?
She's a psychopath, too. She's got her own agenda. One thing is that Garrett is very clear about reading people very well. He's had an alliance, but it's been a symbiotic relationship. I don't think there's any love lost between those two characters.

The season has been heading towards Coulson and his team going up against Garrett. What can you tease about the final showdown?
This is the finale, so this is the ultimate confrontation of the last six episodes that I've been involved with. There's definitely going to be some fireworks. Nick Fury (Samuel L. Jacksonj) is going to show up, and everything is coming home to roost. Not all will be revealed, but a lot will be revealed.

Are you excited for the Agents of S.H.I.E.L.D. finale?

Agents of S.H.I.E.L.D. airs Tuesday at 8/7c on ABC. Watch the latest episode here.