The Walking Dead is set to conclude its amazing six-episode first season run with TS-19, the climatic finale that will leave you on the edge of our seat. The episode airs this Sunday night at 10/9 central, only on AMC. But if you can't wait that long, we have a sneak peek from TS-19, which you can watch by clicking the video below:

In Episode 1.06: TS-19, Rick and the group are allowed into the CDC by a strange doctor. But all is not what it seems in their newfound haven.

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B. Alan Orange at Movieweb
B. Alan Orange