We asked our big damn hero, Nathan Fillion, if there's a single science fiction film that actually made his chiseled mug burst into tears. Find out what he told us below!

On behalf of nerds everywhere, are there any other causes you'd like us to abandon?

Nathan Fillion: Monkeys in space. No more sending up monkeys in space. We tried it, and entertainment has taught us that this is only going to bite us in the ass.

What other science fiction references of Firefly references are you going to try and sneak into the new season of Castle?

I'm gonna go with a little Space Odyssey, some Lost In Space, and I'm going to sprinkle in a little Great Space Coaster.

You're so manly. Has there ever been a science fiction film that made you cry?

I'm sure of it. AI. AI made me cry. I almost cried at Groundhog [Day] does that count for scifi? There's no real reason to cry, they're tears of joy.

What's your science fiction guilty pleasure?

Clone Wars.

Taken on the carpet of Entertainment Weekly's Comic-Con celebration.