Castle Season 6, Episode 1 ("Valkyrie") is just about to end for East Coast ABC viewers. Nathan Fillion, who plays the "ruggedly handsome" writer-turned-NYPD-consultant Rick Castle, is getting ready to live tweet the West Coast premiere. Stana Katic (Kate Beckett) and Lisa Edelstein (Rachel McCord) team up for the Eastern Twitter party.

UPDATE: Castle Season 6 Premiere Review: Cas-kett Fans Worried; Rick and Kate Facing Serious Problem So Soon? [SPOILERS, PHOTOS]

Spoiler Alert: This feature may contain spoilers for those who have yet to watch the sixth season premiere. TV.com has the following synopsis for Castle Season 6, Episode 1, Valkyrie:

Castle Season 6, Episode 1 “Party” as Stana Katic, Lisa Edelstein Live Tweet ‘Valkyrie;’ Nathan Fillion for the West Coast! (CREDIT: ABC)

"Beckett must decide whether to take the high profile job in DC and what to say to Castle about his marriage proposal. Federal investigator Rachel McCord plays a central role in how Beckett decides what to do about her future."

Stana Katic and Lisa Edelstein seem to have developed quite a friendship while filming Castle Season 6. Lisa, who has been known as Lisa Cuddy in the defunct Fox series "House, M.D." is now Rachel McCord in the Castle universe. Evidently, Beckett likes McCord, and Stana likes Lisa.

Castle Season 6, Episode 1 will make viewers laugh, cry, and convulse with glee, according to one of Lisa's tweets.

"Richard Edgar Alexander Rodgers Castle," tweets Stana Katic, engaging fans watching Castle Season 6, Episode 1 with her. In under-60 minutes, she's got 925 retweets and 858 likes. Stars making time for fans on Twitter are always well-received!

Stana also pays attention to how viewers react to the developments in Valkyrie:

"@KatyIsMyAlways: @Stana_Katic WE CANNOT GO FROM BECKETT'S HORNY WINE TO A CAR CRASH TO A COMMERCIAL. WHAT THE HECK IS THIS?!" Xactly

— Stana Katic (@Stana_Katic) September 24, 2013

Those who have to wait before catching the episode may stumble on to spoilers or near-spoilers in Stana's Twitter feed. "Espo saves the day...again! First sniper & now special forces intel," Stana tweeted. "That was fantastic! Thx to all who watched/stayed awake/said Hi/ cried/ laughed/ convulsed with glee. I have to say good night!" Lisa tweeted right after the episode ended for East Coast viewers. Meanwhile, a Castle fan on Twitter asks Lisa, "You seem to have been welcomed perfectly fine in the Castle's fandom -- what do you think about it?" Lisa replies, "Love it!"

Getting ready to live tweet Castle tonight. (West Coast feed- sorry East Coasters). Step one. Turkey meatloaf. http://t.co/rvb0sB8Inm — Nathan Fillion (@NathanFillion) September 24, 2013

For West Coast viewers, the show is on. Tune in to ABC for Castle Season 6, Episode 1, called, Valkyrie. Tweet your favourite Castle stars, too.

More 'Castle' and TV Guide Features:

Castle Season 6 Spoilers: Stana Katic Dishes Scoop, Glams Up in Cas-kett Photoshoot [PHOTOS, VIDEO]
Castle Season 6 Spoilers: Stana Katic, Lisa Edelstein as New BFFs? Cas-Kett Fan Creates Trailer [BTS PHOTOS, VIDEO]