All 16 episodes from the 18th season of the US crime drama following the exploits of the Naval Criminal Investigation Service, led by Special Agent Jethro Gibbs (Mark Harmon). In this season, the team tackles a hostage situation and pursues an arms dealer, and a flashback depicts Gibbs first day at NCIS. The episodes are: Sturgeon Season, Everything Starts Somewhere, Blood and Treasure, Sunburn, Head of the Snake, 1mm, The First Day, True Believer, Winter Chill, Watchdog, Gut Punch, Sangre, Misconduct, Unseen Improvements, Blown Away and Rule 91.