NGTV Guide: Monday, October 26

It’s the beginning of Halloween week, which means some of our favorite characters are getting all dressed up. Let the spooky times commence!

The Castle gang get into the Halloween spirit. Except for Beckett. / ABC

Gossip Girl – the CW 9/8c
“How To Succeed in Bassness” – In need of publicity for his new hotel, Chuck decides to move up his club’s opening and enlists Serena’s help to get the word out to her celebrity clients. Feeling left out of the planning, Blair attempts to win Chuck’s approval by secretly helping him with a problem concerning opening night. Dan is unnerved when he finally watches one of Olivia’s infamous sex scenes with co-star and real-life boyfriend at the time, Patrick Robinson (guest star Simon Miller). Jenny is forced to choose between her relationship with Eric and her new role as Queen Bee. Rufus gets Lily into the Halloween spirit.

Castle – ABC 10/9c
“Vampire Weekend” – As Halloween approaches, Castle and Beckett are called to a graveyard where the body of a young man sporting vampire fangs has been discovered with a wooden stake driven through his heart. Their investigation takes them deep into the heart of New York’s underground vampire fetish community, where they learn that the motive for the victim’s murder may be hiding within the pages of the graphic novel he was writing before his death.