The main antagonist introduced late in the season, a rogue Mossad agent who targets the team. Key Episodes
A former homicide detective with a charismatic but often immature personality.
The first season of (originally titled Navy NCIS ) premiered on September 23, 2003 , on CBS. It follows the Major Case Response Team (MCRT) as they investigate crimes related to the Navy and Marine Corps. Season Overview NCIS - Season 1
Introduced as a recurring probationary agent from Norfolk; he becomes a more permanent fixture later in the season.
A former Secret Service agent who provides profiling expertise and balances out the team's dynamics. The main antagonist introduced late in the season,
Debuts mid-season as the new assistant medical examiner after Gerald Jackson is injured.
The team’s Goth-styled forensic specialist. It follows the Major Case Response Team (MCRT)
The stoic lead agent known for his strict rules and interrogation skills.