1: In NCIS' 1000th episode, the team finally solves the mystery of a 21-year-old villain. Don't miss the thrilling conclusion to this long-running story.

2: After two decades, NCIS fans can celebrate the payoff of the show's most enduring mystery. Discover how the team finally closes the case.

3: The 1000th episode of NCIS brings closure to a story that has haunted fans for years. Explore the twists and turns that lead to a satisfying conclusion.

4: The long-awaited resolution of NCIS' 21-year-old villain story has fans buzzing. Find out why the payoff is worth the wait in this landmark episode.

5: With its 1000th episode, NCIS delivers a satisfying conclusion to a storyline that has spanned decades. Experience the epic showdown for yourself.

6: NCIS fans rejoice as the 1000th episode ties up loose ends from a 21-year-old villain story. Witness the dramatic conclusion to this unforgettable saga.

7: In its historic 1000th episode, NCIS finally unravels the mystery of its most elusive villain. Don't miss the shocking twists and turns in this epic finale.

8: After 21 years, NCIS brings its long-running villain story to an epic conclusion in its milestone 1000th episode. Experience the thrilling payoff now.

9: NCIS' 1000th episode marks the end of a saga that has captivated fans for over two decades. Prepare for a shocking resolution to this unforgettable storyline.