Well-connected Special Agent Emily Prentiss joins the team, as they take on two serial killers, who seem to be in competition with each other.

Castle and Beckett find themselves handcuffed together in a locked room with no memory of how or why they got there.

While on 21st-century Earth, Sisko takes charge of a hostage situation in order to be sure history happens as it was recorded.

A routine estate sale lands Melinda in the center of dark forces battling for the soul of a little girl ("Cassidy") who's been trapped in a violently haunted house for years.

The team must defuse three dirty bombs headed for unknown locations across the United States; one couple prepares for a wedding while another prepares for the end of their marriage.

Martin exposes a corrupt parole officer, and a Brazilian street musician uses his guitar to win the heart of a beautiful woman. In addition, Jake forms a bond with another mute boy.

Jack reluctantly agrees to search for his daughter Hannah's boyfriend who has disappeared. He was last seen running away from home in Chicago to be with Hannah in New York.

While a juror in a murder trial, MacGyver starts his own investigation into conflicts with evidence and facts presented to them.