A deadly explosion at a military-sponsored charity event is investigated, as is a news reporter's claim of who is responsible.
A body with human bite marks is discovered, and the sole witness claims a zombie killed the man. Castle and Beckett then explore New York City's zombie subculture to unearth the murderer.
Miami sorority sisters are murdered one-by-one, and the CSIs try to stop the killing spree. One death occurs at a horse stable, and the owner's daughter may know something about the crime.
Raj makes an attempt to cure his phobia of talking to women; and Penny spies on Leonard and Priya with the help of Bernadette.
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