Kathryn Taylor Smith

The BAU is called upon when bioterrorism is suspected in a series of mysterious deaths and Garcia visits her stepbrother to take care of a difficult family issue.

Steve sees the aftermath of a gang of robbers dressed as Santa Claus, Danny tells Charlie a bedtime story involving a Christmas miracle, and Junior takes a position on the Five-0 task force.

The team is taken hostage when it inadvertently crashes a bank robbery in progress; Sylvester's feelings for Florence grow.

John teaches Ben several key tips to being a police officer, including the proper ways to make a death notification and arrest a suspected drug user. Sammy stays with Nate's family while he sorts out his marital problems. Lydia and Josie handle a drug-related murder case with an unorthodox suspect.