Chuck Season 4 Episode 1 (Chuck s04e01) with title “Chuck Versus the Anniversary” aired on Monday, September 20th 2010 at 08:00 pm via NBC Network.
Here is summary Chuck Season 4 Episode 1 :

Season 4 opens with Chuck engaging in a sweeping quest to find his mother (Linda Hamilton), all while keeping the rogue mission a secret from his sister. Meanwhile, Sarah and Casey journey to Russia to probe a mysterious organization and its operative (Dolph Lundgren)

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