Casting is really weird. Honestly, when Alan Ruck's name came up - and I've worked with Alan before - I went, "Yes, he's perfect." He came in and read for us, which was really sweet of him because he didn't have to, and he nailed it in seconds. We knew exactly who we had. That stuff is really good and fun.

I've always been a sci-fi geek, and I've always loved it. It's my favorite genre of all. The irony of ironies is that, in my early career, I just really never worked in it. "Star Trek" was very interested in me, partially because I did "From the Earth to the Moon," and I was really interested in them, but the timing just never worked out.

I ended up working on "Chicago Hope" and other things, but always with the idea that, eventually, I would want to take what I'd learned in character drama and try to apply that to the genre that I love, which is science fiction and "The Twilight Zone" type mysteries.

Hardly anybody thinks about typing in their social security number as ID. Hardly anybody pays attention to the myriad of security cameras. There isn't anybody that worked on this show that doesn't look at security cameras differently than when they started.

When we finally had a cast and could see what they could do, here was an opportunity to go back and modify things. We didn't actually do that much modifying, but we did enough to make it feel as if they fit in their own skin, and we got a lot of good input from them. They're a terrific cast. They worked really hard.

When you're working on a television show with actors, what you hope you're doing is playing jazz with them all the time. You see what they're giving you, so you try to write back to that, and then they play with that, and you get a sense of what is going on. That's just a natural way in which TV series usually work.

I feel confident that it will always keep everybody guessing, and yet not in that weird, maddening way where it's like, "Oh, come on, guys!" I think you will be freaked out by the end. I really do. I don't think you'll see it coming at all.