Craig Robert Young

After a vice admiral's laptop is infected with ransomware, he enlists McGee and the NCIS team to track down the hacker before the computer virus eliminates his personal and professional files. Also, Alex takes time off to assist her mother, Marie Quinn (Mercedes Ruehl), after she receives a “911” text.

When Charlie's vividly surreal dreams lead him to believe Claire's baby, Aaron, is in danger, Locke suspects Charlie may be using again. Meanwhile, Sawyer encourages Hurley to act on his attraction to Libby, on "Lost."

When a suspect threatens to release a deadly virus, the Five-0 teams up with Special Agents G. Callen (Chris O'Donnell) and Sam Hanna (LL Cool J).

When Joy chooses to marry Simon, Melanie breaks the news to Bob and has pity sex with him, as Victoria goes to New York for a role after being told it's opposite Brad Pitt.

Jonas, Mack and Grey have their hands full keeping a pop diva safe from harm while Bob and a Justice Department escort face extreme danger as they return a prisoner to his own country to face his execution.

The team searches for Hetty in Romania; Callen uncovers information about his past.