Karina Noelle Castillo

After Mateo and Cheyenne disagree on the best way to celebrate her 21st birthday, Cheyenne enlists Bo's help. Much to Garrett's chagrin, Glenn plays matchmaker to help Jerry and Sandra complete their family, and Dina attempts to help Amy keep a big secret from Jonah.

Special Agent Alden Parker is still on the run with his ex-wife Vivian, so the team investigates who from his past might have a personal vendetta against him in hopes of clearing Parker's name.

Gibbs and McGee head to Alaska while the team works at home to uncover the conspiracy behind the serial killer.

Gibbs and Parker go on a road trip to find one of the serial killer's victims. Also, Agent Knight goes undercover at a large manufacturing company with ties to the murders.

Despite everyone else's doubts, Shaun is hopeful that Carly is truly fine with his friendship with Lea. Meanwhile, the team treats a young boy—born without a fully formed trachea and unable to speak—who may be a good candidate for an experimental procedure.