As part of its massive Left 4 Dead advertising campaign, Valve will begin airing a pair of television commercials on network and cable television starting November 8. The first TV spot is available for online viewing above, featuring 29 seconds of footage cobbled together from the game’s opening sequence. Although brief, the clip does give viewers a general idea of what L4D is all about and highlights its most appealing aspect: four-player co-op. Have a look.

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