You can add Jon Hamm to the ever-growing list of celebrities who have appeared on The Simpsons: the Mad Men star will voice an FBI supervisor in the December episode "Donnie Fatso."  Executive producer Al Jean told EW, "there will be no Mad Men reference," though the show already has that satirical territory covered pretty well.  You can get a hint of what Hamm looks like as a live-action FBI agent in Ben Affleck's The Town (in theaters September 17, 2010) --- the fourth season of Mad Men premieres Sunday, July 25th on AMC.

Hit the jump for news of Olivia Munn's appearance on Chuck, and details on the return of Caprica.

You certainly can't accuse Chuck of skimping on the guest stars: Oliva Munn will join Dolph Lundgren and Harry Dean Stanton for the September 20th season four premiere.  It almost seems like they're trying to distract us from the most anticipated matriarchal casting since How I Met Your Mother... EW reports Munn will play "an impossibly cool, smart, and pretty CIA agent who intimidates and schools Chuck and Morgan."  The Attack of the Show co-host recently joined the NBC family as a regular on the sitcom Perfect Couples, set for a midseason debut.

The first episodes of Caprica unfolded this spring on Syfy, and the network has announced a January 2011 return date to wrap up season one.  If you happen to have a Comic-Con pass in your pocket right now, you can check out brand new footage at the July 23rd panel devoted to the Battlestar Galactica prequel.  Otherwise, you can wait until the network uploads the season 1.5 trailer to Syfy.com.

Here's the official press release:

CAPRICA RETURNS TO SYFY IN JANUARY 2011

New York, New York – July 21, 2010 – Syfy has announced the highly-anticipated return of critically-acclaimed series Caprica. The second half of season one premieres in January 2011 (date TBA), and kicks off with a thrilling pace as the citizens of Caprica deal with the chaotic aftermath of the mid-season finale’s harrowing events.

In season 1.5, the once idyllic world of Caprica – as well as life across the colonies – falls prey to an explosive chain reaction of consequences set off by the characters’ many questionable actions in the season’s first half. Tensions rise, power shifts and the line between reality and the virtual world becomes increasingly blurred as everyone struggles to learn – and conquer – the stakes in this volatile setting. As the season races towards its stunning conclusion, events of each episode lay the framework for the inevitable (and brutal) clash between the newly-created Cylon race and their human creators.

An all-new trailer for season 1.5 will premiere at Caprica’s Comic-Con panel on July 23, and before landing on Syfy.com, it will be available exclusively on Microsoft’s Zune Marketplace on Xbox LIVE and Windows PCs through the Zune PC software available for free at www.zune.net. (July 26).

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Caprica stars Eric Stoltz (Daniel Graystone), Paula Malcomson (Amanda Graystone), Esai Morales (Joseph Adama), Polly Walker (Sister Clarice Willow), Alessandra Torresani (Zoe Graystone), Magda Apanowicz (Lacy) and Sasha Roiz (Sam Adama).

Caprica is a prequel to the award-winning series Battlestar Galactica. The series is from Universal Cable Productions, and is executive produced by Ronald D. Moore and David Eick. Jonas Pate serves as co-executive producer and director.

Universal Cable Productions creates quality content across multiple media platforms for USA, Syfy and other networks.  A leader in innovative and critically acclaimed programming, UCP is the studio behind USA's Royal Pains, Law & Order: Criminal Intent, Psych, In Plain Sight, Covert Affairs and Facing Kate, as well as Syfy's Eureka, Warehouse 13 and Caprica. The studio also produced the long-running series Monk and Battlestar Galactica. UCP is a division of NBC Universal.

Syfy is a media destination for imagination-based entertainment. With year round acclaimed original series, events, blockbuster movies, classic science fiction and fantasy programming, a dynamic Web site (www.Syfy.com), and a portfolio of adjacent business (Syfy Ventures), Syfy is a passport to limitless possibilities. Originally launched in 1992 as SCI FI Channel, and currently in 96 million homes, Syfy is a network of NBC Universal, one of the world's leading media and entertainment companies. (Syfy. Imagine greater.)