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 think that was in the discussions when NBC finally bought it and was trying to figure out how to distinguish it as an event. I'll be honest, we did shoot it with the idea of it being an on-going series, but because I am insane when I get to the end of a season and they give you a big, giant cliff-hanger with no answers, I insisted that we provide all the answers to the questions that we set up, at the beginning.

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.

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 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.

I feel confident that we will have a beginning, middle and end, in this season, and it was wise of NBC to then call it what it really is, which is a mini-series. "24" is a really good example, in that there was a definitive beginning, middle and end for the first season. They had a slightly different format than we have, but the second season just retained Jack Bauer and a few other players, with the same basic format and idea, but it was a completely different show.

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.