Chuck's Best Guest Stars
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Robert Englund as Dr. Stanley Wheelright
Given his Freddy Krueger past, it was only fitting that Englund played a scientist who had developed a toxin that induced nightmares (regardless of what street you lived on).
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Dolph Lundgren as Marco
Fresh off his appearance in the big-screen bruiser The Expendables, Lundgren played a Volkoff goon who apparently was a huge Rocky IV fan, given his tendency to evoke Ivan Drago with such bon mots as, "I must break you."
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Tony Hale as Emmett Milbarge
When original Buy More manager C.S. Lee got snatched up by Dexter, the Arrested Development alum ably stepped in as Chuck and Morgan's new, domineering boss. His sudden death in the Season 3 premiere, it could be argued, signaled the spy comedy's step in a higher stakes direction.
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Brandon Routh as Daniel Shaw
At first, this well-chiseled CIA agent was but a wrench in the works for Chuck and Sarah's UST (Unresolved Sexual Tension). But once his true colors were revealed — an enemy agent who held Sarah responsible for his wife's assassination, he'd go on to kill Chuck's dad — he devolved into pure evil, and later made a killer comeback during the show's goodbye run. (Oh, who are we kidding? No one is looking at this photo's caption.)
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Bo Derek as... Bo Derek
Worth noting if only for 1) the onetime pin-up's willingness to position "herself" as an evil spy, and 2) Sarah's discomfort with the things a pubescent Chuck apparently "did" with this Perfect 10's poster.
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Carrie-Ann Moss as Gertrude Verbanski
Besides big guns and fine cigars, what gets John Casey's engine running? That question was answered in the final season, when viewers met his fierce and formidable (yet frisky!) female equal. To think that The Matrix's wispy Neo was ever worthy of this badass broad!
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Cheryl Ladd as Emma
The very title of this Season 5 episode, "Chuck vs. The Baby," had fans in a frenzy, speculating how Sarah herself might have secretly birthed a kid. But the only mother figure turned out to be Sarah's own mom, who it turns out had been quietly raising a little girl that Sarah rescued during a CIA mission.
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Natalie Martinez as Kayla
No, she wasn't a "guest star" per se, but we wouldn't miss an opportunity to note that the oneday Dome denizen was part of the original cast — and even appeared in promo pics such as this one — and yet never actually made it into even the pilot, as an edgy gal Chuck was lusting after. (As the show's creators have explained, once a fella meets Sarah Walker, all other lasses simply and sometimes literally fade into the woodwork.)
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Matt Bomer as Bryce Larkin
Chuck never would have become the Intersect were it not for his college buddy-turned-CIA agent, who pulled a con on Fulcrum that would've made Neal Caffrey proud.
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Melinda Clarke as Sasha Banachek
Chuck's newbie seduction skills (see: "John Laroquette as Roan Montgomery") were put to the test when he had to romance the dangerous "Black Widow" in order to retrieve the Cipher around her neck. (Little did we suspect at the time that Clarke would one day be just as sinister when facing off against another spy, named Nikita.)
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Danny Pudi as Vali Chandrasekaren
Community fans got not one but two treats in Season 5's "Chuck vs. The Hack-Off" when Pudi replaced Lester at the Buy More, and later Yvette Nicole Brown secretly cameo'd as another Nerd Herder.
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Kristin Kreuk as Hannah
With Sarah in Season 3 getting cozy with Daniel Shaw (played by Brandon Routh aka Superman), it was only fitting that Chuck would be charmed by TV's erstwhile Lana Lang, here playing a computer whiz who went on to enjoy an all-too-brief stint at the Buy More.
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Bruce Boxleitner and Morgan Fairchild as Drs. Woody and Honey Woodcomb
Who else could have brought Devon into this world but these awesome physical specimens?
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Armand Assante as Allejandro Goya
The Costa Gravas dictator famously introduced us to Casey's "Angel of Death" nickname as well as gave Awesome something to do, as his personal physician-slash-statue model.
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Summer Glau as "Greta"
Of all the Gretas that passed through the Buy More after the CIA covertly co-opted the store, Glau's was our favorite — one, due to her hair-trigger ferocity, and two, because of the veiled dialogue nod to her and Adam Baldwin's previous gig together, on Firefly.
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Rachel Bilson as Lou
Long before getting together with Sarah, Chuck had a brief romance with this deli owner, whom he suspected was up to something bad. And she indeed was a smuggler... of imported meats.
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Jordana Brewster as Dr. Jill Roberts
Jill had already jilted Chuck once, back at Stanford. And when she reentered his life, it was heartbreak anew when she turned out to be a double agent — by no means the first or last lovely to charm our No. 1 nerd while hiding an agenda.
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Mercedes Masohn, Mircea Monroe and Mini Anden (not pictured) as the C.A.T. Squad
We were head over stiletto heels from the moment the show cued up a retro-style promo (watch it here) that introduced us to "Zondra the Bitch," "party girl" Amy and "cold-hearted" Carina, who with "pride and joy" Sarah formed a crimefighting quad that frankly made Charlie's Angels look like nuns.
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Chevy Chase as Ted Roark
Steven J.'s former partner-turned-nemesis threatened every member of the Bartowski clan — father, son and daughter — in his quest to create a new Intersect for Fulcrum.
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Gary Cole as Jack Burton
Sarah's con man father raised her on the road under different aliases and taught her all his sneaky tricks, ultimately pushing her into the arms of the CIA after he was arrested.
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Timothy Dalton as Alexei Volkoff
Chuck rolled a 007 and came out a winner with the onetime James Bond's arc as a big baddie who was hot for "Frost" (aka Linda Hamilton's Mary B.).
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Nicole Richie as Heather Chandler
Our expectations were set quite low when Richie — at that time was merely a costar of The Simple Life — entered the mix. But damn if she didn't hold her own as Sarah's "mean girl" high school classmate-gone-bad.
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Scott Bakula as Stephen J. Bartowski
Chuck got more than he bargained for when he went looking for his absentee father to walk Ellie down the aisle — he discovered that Dad was "Orion," the creator of the Intersect!
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Linda Hamilton as Mary Bartowski
Who can forget the 2010 San Diego Comic-Con crowd geeking out to the news that the Terminator-terminating Sarah Connor herself would be playing Chuck and Ellie's badass momma.
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John Larroquette as Roan Montgomery
When Chuck needed a crash course on the art of espionage-based seduction, the team called in the CIA's legendary ladykiller.
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Christopher Lloyd as Dr. Leo Dreyfus
Great Scott! When Chuck began having bad dreams toward the end of Season 3, he sought out the help of Lloyd's CIA shrink.