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When Mycroft tells them there has been an "incident", Sherlock merely raises an eyebrow. When Mycroft tells them to stock up on weapons and pack emergency bags, Sherlock snorts. When Mycroft loses his temper and tells them to prepare for the zombie apocalypse, Sherlock laughs out loud. When Mycroft doesn't join in, Sherlock sobers up. A Johnlock Zombie Apocalypse AU.