EXCLUSIVE: James Marsden Opens Up About 'Westworld' Finale, Says Season 2 Talk is 'Pure Speculation'

James Marsden was just as shocked about last week's Westworld's finale as we were.

ET's Cameron Mathison caught up with the actor on the red carpet at the Critics' Choice Awards in Los Angeles on Sunday, where he dished on the HBO series' success -- and its jaw-dropping season one finale.

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"The cast was there, the showrunner was there, the ideas and the philosophies and all that was aligned," Marsden explained of what made the show click. "You just, you never know until it's out and people are discussing it and theorizing about it. You never want to jinx yourself, but it's been fun to sit back and watch it kind of take off."

"Take off" the show definitely did, among both fans and the awards show circuit. The futuristic drama is nominated for Best Drama Series at Sunday's Critics' Choice Awards -- and Evan Rachel Wood and Thandie Newton got nods for Best Actress and Best Supporting Actress in a Drama Series, respectively.

As for the show's shocking twists and turns, Marsden said storylines were just as hard to predict as the series' success.

"We never knew! The actors never really knew what the hell was going on. We would get the scripts sometimes four or five days before we'd shoot the next episode, so we didn't know the end game either," he explained.

"I got the final script and was like 'Whoa,' but for a while we had to kind of keep our mouths shut," he said, adding that he's likewise in the dark about season two. "It would be pure speculation."

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Marsden was similarly tight-lipped when ET's Lauren Zima spoke with him at Thursday's GQ Men of the Year event, however he did offer more of his reaction to the shocking season finale.

"I didn't utter one word for about an hour and half and just hung my mouth open and walked around the house with my head in my hands," he revealed. "It was like that moment where you realize you read some of the best writing you ever read. All the questions I had as an actor, it all came together… the puzzle pieces came together.

"It was pretty special and fun to be a part of, and now getting to watch the rest of the world kind of experience the same thing," he concluded.

The puzzle pieces may have come together for Marsden, but Teddy somehow still can't figure out the maze.

WATCH: James Marsden Gets a Kiss From Crush Helen Mirren, Reveals Why He Passed on 'Magic Mike'

James Marsden Shares a Smooch With His Celebrity Crush, Helen Mirren

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