Lea Michele, Glee
Rachel performs in the Dec. 6 episode of the Fox hit, aptly titled "Swan Song."
New Girl
The gang (including guest star Olivia Munn) look on as Jess (Zooey Deschanel) reunites with Sam (David Walton) in "Santa," airing Dec. 11.
John Krasinski, The Ofice
Jim needs help from Pam in the Nov. 29 episode, titled "The Target."
Christopher McDonald & Damon Wayans Jr., Happy Endings
Brad and Jane's dad (guest star McDonald) fail to bond at the 20th anniversary party of the Kerkovich family mattress business.
Justin Chambers & Sara Ramirez, Grey's Anatomy
Callie recruits Jackson to help find a way to fix Derek's (Patrick Dempsey) hand in the Nov. 29 episode.
Heather Morris, Dianna Agron & Naya Rivera, Glee
Quinn is back! The original Cheerio trio perform in the "Thanksgiving" episode of the Fox hit.
Amy Poehler & Megan Mullally, Parks and Recreation
Uh-oh! Ron's (Nick Offerman) ex, Tammy Two, is back to wreak havoc in Pawnee in the Dec. 6 episode.
Tina Majorino & Neve Campbell, Grey's Anatomy
The Scream star plays Derek's sister in the Dec. 6 episode of the ABC drama.
Revenge
Baby Carl's christening brings everybody together on the Dec. 2 episode of the ABC drama.
Tina Fey & James Marsden, 30 Rock
Liz and Criss decide to get married in the Nov. 29 episode, titled ""Mazel Tov, Dummies!"
Downton Abbey
The new season of the addictive PBS premiered in the U.K. on Sept. 16, but unfortunately we only have these photos to tide us over until it premieres here in the States.
Nina Dobrev, The Vampire Diaries
Elena's a vampire, and she's about to experience some serious "Growing Pains." Thankfully, best friend Bonnie (Kat Graham) is there to help her out on the season-four premiere of The Vampire Diaries.
Kate Hudson, Glee
Playing Rachel Berry's dance teacher, the hot guest star shows off her moves in the new season.
Kristin Chenoweth, The Good Wife
The Broadway star and Glee scene-stealer will guest as a pushy reporter who is determined to get the truth about the Florricks' marriage and campaign.
Maura Tierney, The Good Wife
The ER actress guest stars as a self-made millionaire who has become a top dog of Chicago politics.
Bitsie Tulloch & David Giuntoli, Grimm
Nick keeps vigil at Juliette's hospital bedside in the second season premiere.
Senator John McCain & Amy Poehler, Parks and Recreation
Leslie Knope makes new friends in Washington, D.C.
Dominique McElligott, Hell on Wheels
Lily Bell embraces a new life and new garb in the season two premiere.
Jerome Flynn, Game of Thrones
And this, kids, is how you go from being a sellsword to Ser Bronn of the Blackwater.
Gabriel Mann & Emily VanCamp, Revenge
Vengeance (and red Sharpie action) will have to be put on hold for some more pressing matters in the May 23 finale—Nolan and Emily find themselves a bit tied up.
Lea Michele & Cory Monteith, Glee
Here comes the prom king and queen? Maybe. But all we know for sure is that it's prom night at McKinley High in the May 8 episode, and the seniors are dressed to the max to dance the night away. The theme, Dinosaurs, was picked by Brittany, the senior class president.
David Boreanaz and Emily Deschanel, Bones
In the May 7 episode, Booth and Brennan go Hollywood—and are called to investigate a murder while on the set of a film based on Brennan's latest book.
Frederick Weller, Mary McCormack & Rachel Boston, In Plain Sight
Let's all join the gang at In Plain Sight and raise a glass to its five great seasons. The final episode, airing May 4, finds Mary torn between a witness and her family. Plus, big changes are afoot at WITSEC.
Jenna Ushkowitz, Glee
Tina Cohen-Chang finally gets a song (or at least a cool costume), and everything gets a little bit Phantom in the May 1 episode.