Yahoo! TV Blog talks to Alyssa Milano about her guest role in the next episode of Castle “A Rose for Everafter” which airs on Jan 11th.

To read the full interview (includes minor spoilers) go to tv.yahoo.com

So how did you get involved in this episode of “Castle”?

They actually had offered me a couple of different parts over the past few months, and I just wanted it to be special when I actually did the show because I’m a fan of the show. I think the writing’s really great. So then when this one came up, and the character was the one that got away from Castle, I just thought it would be really fun.

What were the other parts they had offered you?

Well, one was a suspect, and the other was a victim – there were two scripts.

“Castle” has really been gaining momentum lately. As a fan, what do you think it is that makes the show so appealing?

I think [on] any show, what makes it appealing is the cast of characters and the chemistry within. It’s really like lightning in a bottle. You really have to have the right formula to make everything work. I think when you watch this show, there is a sense of wanting to know the characters and loving the dynamic between Castle and Beckett. And I also think the writing is really smart. I think because Castle is a novelist, they’re able to take more of a risk and write really smartly.

You just mentioned chemistry. How was the chemistry between you and Nathan Fillion?

Really good, really good. We’ve known each other for about nine years now, and he’s such a sweet, sweet guy. From the second I stepped on the set, he was so appreciative and hospitable throughout the whole process, and I think a bit of that you can actually feel.