Will (Matthew Morrison) stages "The Rocky Horror Show" for the annual school musical after learning of Emma's (Jayma Mays) newfound love for the cult classic. Despite Sue's (Jane Lynch) usual scheming, the members of New Directions inject their distinctive style to such timeless tracks as "The Time Warp" and "Damn It, Janet." Watch the sneak peek!

Delving into the mind of a brilliant naval scientist, Abby (Pauley Perrette) becomes fixated on solving her murder, while DiNozzo's (Michael Weatherly) latest fling leads to an interesting Halloween.

When Sabrina's (Shannon Woodward) boyfriend can't make it to the deli guy's Halloween party, Jimmy (Lucas Neff) offers to put on his costume and go in his place. Virginia (Martha Plimpton) takes Maw Maw (Cloris Leachman), who is dressed as a cat, trick-or-treating while Burt (Garret Dillahunt) plots ways to play tricks on Jimmy. Meanwhile, when a box containing videos of Hope's mother arrives from prison, Jimmy must decide whether or not to let Hope see them. Virginia explains that children need to be protected from the truth, leading Jimmy to question what exactly his parents have been keeping from him.

The BAU team must find a killer who has struck Detroit for the past three years solely during the raucous pre-Halloween celebration "Devil's Night."

Inspired by the "Shrek" movie series, this Halloween special concentrates on Shrek (Mike Myers), who cannot wait to start celebrating his favorite holiday -- ogre style. Instead of the usual tricks or treats, Shrek challenges Donkey (Dean Edwards), Puss in Boots (Antonio Banderas) and the other fairy-tale characters to a scary storytelling contest. Before the night of frights can begin, they learn that they must all spend the night in Lord Farquaad's haunted castle. The last one to be scared "Shrekless" will win.

Infection spreads at Greendale Community College, causing a walking nightmare. Pierce (Chevy Chase) and a few other Greendale students ingest a bio-hazard substance at the school Halloween Party, causing them to exhibit flu-like symptoms, and they soon begin turning into zombies. It is up to the rest of the gang to save themselves and the school when Dean Pelton (Jim Rash) locks them in with the zombie-infected student body.

When Darryl (Craig Robinson) takes an idea to corporate over his head, Michael (Golden Globe winner Steve Carell) freaks out. Everyone in the office is in a competitive mood as the Halloween costume contest gets underway. Meanwhile, Pam (Jenna Fischer) tries to get the truth out of Danny (guest star Timothy Olyphant) about their dating history.Plus check out the clip from "The Office" webisode!"Horror on the Third Floor." The Dunder-Mifflin group decides singing and dancing are out, and gore is in. Under Ryan's (B.J. Novak) direction, Kelly (Mindy Kaling) and Erin (Ellie Kemper) readily take on their new roles as scream queens in his slasher flick "The 3rd Floor."

Excited about Halloween, Todd (Ben Rappaport) tries to get the office in the holiday spirit, but his co-workers have no idea what Halloween is all about. After a series of Halloween pranks and an attempt to explain why people dress up, Todd decides to throw a costume party. Taking advantage of the social setting, Todd tries to get closer to Asha (Rebecca Hazlewood), but the plan backfires when Tonya (Pippa Black) makes a pass at Todd.

If you're planning a house party on Halloween night this year, don't miss one of the biggest TV specials of fall 2010. It's about time there's a TV series about zombies.

When Zoey (Jennifer Morrison) enrolls in Ted's (Josh Radnor) class, she manipulates his students into taking her side in the fight to save the building being torn down to make room for his project.Meanwhile, Marshall (Jason Segal) and Lily (Alyson Hannigan) spot Robin (Cobie Smulders) marching in the Halloween parade of shame.

Beware of Ouija boards, vampires and unexpected guests in the 21st annual installment of the "Treehouse of Horror."In "War and Pieces," the first of three spine-tingling tales, Marge (Julie Kavner), worried about the effects of excessively violent video games, encourages Bart (Nancy Cartwright) and Milhouse (Pamela Hayden) to give wholesome, classic board games a shot. The best friends discover that board games aren't boring after all when they find themselves playing a real-life game in which they must beat all the challenges before they are allowed to return to home.The supernatural spells continue in "Tweenlight," when Lisa (Yeardley Smith) becomes smitten with a mysterious new student, Edmund (guest voice Daniel Radcliffe), who also happens to be a vampire. When a romance blossoms, the young lovers run away to Dracula-la Land, leaving Homer (Dan Castellaneta) to come to Lisa's rescue.In the final frightening fable, "Master and Cadaver," Homer and Marge set sail on a romantic second honeymoon, but are interrupted when they rescue Roger (guest voice Hugh Laurie), a castaway who escaped an attempted poisoning on his ship. Convinced that Roger is sabotaging their getaway and plotting a murder of his own, Homer and Marge take matters into their own hands.

"It's The Great Pancake, Cleveland Brown" features Cleveland (Mike Henry), who crushes Cleveland Jr.'s (Kevin Michael Richardson) spirit when he forbids him from trick-or-treating because he thinks he is too old. Junior reinvents himself as a "cool kid" and is invited to attend a Halloween party with Roberta (Reagan Gomez). When he gets picked on and is unhappy with his new persona, Cleveland and the gang come to Junior's rescue and encourage his enthusiasm for the holiday.

"Halloween on Spooner Street" centers on Peter (Seth MacFarlane) and Joe (Patrick Warburton),who team up to execute a series of painful and humiliating Halloween pranks on unsuspecting family, friends and neighbors. While Brian (MacFarlane) shows Stewie (MacFarlane) the ropes of trick-or-treating, Meg (Mila Kunis) sets out to attend her first high school Halloween party with high hopes for the evening.

In the "Best Little Horror House in Langley Falls," Stan (Seth MacFarlane) and Francine (Wendy Schaal) have had the scariest haunted house on the block for eight years running, but when one of their neighbors provides some stiff competition, Stan ups the ante with a "killer" set-up. Meanwhile, Steve (Scott Grimes) falls head over heels for his overprotective friend's younger sister and competes to win her heart in a Halloween showdown.