The new campaign will be available for both L4D and L4D2 and takes placed from the original Survivors' perspective as they make their way South. Borrowing a tactic that's used in nearly every zombie flick, Valve says players will have to sacrifice a comrade to complete the finale (think back to Bill's absence in The Passing).
Along with the trailer embedded above, Valve has released the first three installments of a four-part comic. The initial entries available online here (including downloadable PDF copies), while the fourth is set to arrive next Tuesday with The Sacrifice.
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