By Shaun Harrison. In the TV Series, it was stated by Dr Jenner that a corpse can reanimate between three minutes and eight hours after death, though there are instances where reanimation seems to happen much quicker, and the video game suggests that it could happen in seconds. Those zombies are still clinically alive and can be restored, where the "walkers" of The Walking Dead are in fact dead, presumably not under any control, and cannot be restored.
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The primitive cult-like group serves as the main protagonists for a sizeable story arc in the comics. Page 2: Before he was killed by Negan, Glenn was something of an expert when it came to dealing with Walkers. But acting in his favor right now, after the time jump, is his lack of mullet and leveled-up fighting skills.