Before you sit down to watch the highly anticipated "NCIS" and "NCIS: Origins" crossover episodes, be sure to watch these three classic "NCIS" episodes.

NCIS' biggest crossover to date brings Mark Harmon back to the franchise, but his story in Origins doesn't fully have the impact it intends.

NCIS: Sydney Season 3 Episode 5, titled "Black is White," follows the investigation of a case where a USB is found in a dead ...

In NCIS season 23 episode 5, a prison break forces the team to reopen a decades-old naval murder, uncover family secrets and reunite with retired agent Vera Strickland.

A beloved television couple is back in the spotlight to continue their story years after it began. "NCIS" alumni Michael Weatherly and Cote de Pablo returned to the small screen as Anthony "Tony" ...

NCIS: Origins season 2 episode 5 follows young Gibbs investigating a suspicious train accident in Serenity, California, ...