Caleb Castille

A night at an amusement park takes a deadly turn when a rollercoaster malfunction leaves lives hanging in the balance.

Sam, Callen and Rountree travel to Afghanistan when Marine Lieutenant Colonel Sarah "Mac" MacKenzie asks NCIS to help with a sensitive case after two SEALs claim their chief murdered an unarmed prisoner.

NCIS assists the DOJ in the investigation of an arsonist who targets an FBI safe house that's protecting a political activist seeking asylum. Also, Eric deals with the aftermath of Nell leaving the team

While Sam investigates the murder of an Iranian exile working to overthrow the current regime, he must also try to save Agent Roundtree (Caleb Castille), a new agent who's having an unexpectedly adventurous first day on the job, when he accidentally triggers a bomb. Also, Nell makes a decision about her future with NCIS.

When an FBI agent is killed while trying to track the location of an undercover agent, NCIS must find the missing agent before the criminals he was investigating do.