Oh, Castle fans, I can feel your excitement right now. Although I have my concerns about this noir episode, I have to admit that I am starting to get a little bit excited about it. Why, you ask? The promotional photos look phenomenal. You guys are all aware about how unsure I am about "The Blue Butterfly" - and even though it looks awesome from the pictures, I am still not one hundred percent sold on the idea - but I am willing to give it the benefit of the doubt and hope for the best. I have to say the clothes look spectacular. Have you seen that fur number Stana Katic is rocking? It's gorgeous!

In case you're curious about what this highly anticipated (and by that, I mean fans counting the seconds to February 6) noir episode is all about, here's what we have for you: When Castle and Beckett investigate the murder of a treasure hunter, they find out the case is linked to a mysterious homicide from 1947 involving a hard-boiled private detective. Castle realizes the only way to solve the present-day murder is to solve the murder from the past. The 1947 case comes to life through stylized flashbacks, featuring Castle as the private eye and Beckett as a femme fatale. Mark Pellegrino guest stars as the bad guy and I have to say - as a hardcore LOST fan - I am super excited to see him on Castle.

Now go ahead and check all these amazing photos. I know you're dying to do it.

"The Blue Butterfly" is scheduled to air on February 6 at 10pm on ABC.

Castle Photos: 4.14 "The Blue Butterfly"

Mark Pellegrino just might be the new go-to guy in Hollywood when you need a pivital character already filled with the show's mythology.  Last year Pellegrino was cast in the season 5 finale episode of Lost as Jacob, a mysterious character we've heard mentioned on the series since season 3, but never actually seen.  And now, according to Michael Ausiello at EW.com, Pellegrino has been tapped for a recurring role on Supernatural next season as...Lucifer.

For the Lost fans out there who are concerned about whether Pellegrino will return for Lost's final season, fear not.  Though no official word has been given from ABC, the fact that Pellegrino is listed as a 'recurring' character and not a regular is a sign that he will probably be doing both shows.  Which, really, is kinda cool.  He will be playing pivotal, never before seen characters on two sci-fi, mythology ladden shows.  One, in its final season and the other, possibly in its last season as well.  Cudos to Pellegrino on landing these roles and I can't wait to see more of what he has to offer both shows.

Source: Ausiello Files

Mark Pellegrino Joins 'Supernatural' in Recurring Role