Ryan Doom

When a dead man is found with human bite marks on his body, a witness claims the deceased was attacked by a zombie.

A sailor who lost two siblings -- Marines who were killed in the line of duty -- needs a bone marrow transplant; Bishop returns to Oklahoma for Thanksgiving.

Agent Bishop questions her previous work at the NSA after being sent to Gitmo to gather evidence for a Navy chaplain murder case; Bishop's brothers visit for Thanksgiving.

The team finds itself investigating the murders of three different people, only to discover that two of the murder victims are linked and may have been killed by the same person. One of these cases becomes personal for Mac.

When Jimmy returns to work, he hires Sabrina’s cousin Shelley (guest star Kate Micucci) – a/k/a “Dead Tooth” – to babysit Hope. Meanwhile, Burt tries to get Virginia to quit smoking.

When Sabrina’s boyfriend can’t make it to the deli guy’s Halloween party, Jimmy offers to put on his costume and go in his place. Virginia takes Maw Maw, who is dressed as a cat, trick-or-treating while Burt plots ways to play tricks on Jimmy.