The original ensemble cast established the core dynamics of the series:
The main antagonist introduced late in the season, a rogue Mossad agent who targets the team. Key Episodes NCIS - Season 1
A former Secret Service agent who provides profiling expertise and balances out the team's dynamics. The original ensemble cast established the core dynamics
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