As the world is overrun by zombies, a group of scientists and military personnel sheltering in an underground bunker in Florida must decide on how they should deal with the undead horde.
When two bumbling employees at a medical supply warehouse accidentally release a deadly gas into the air, the vapors cause the dead to rise again as zombies.
During an escalating zombie epidemic, two Philadelphia SWAT team members, a traffic reporter and his TV executive girlfriend seek refuge in a secluded shopping mall.