1: 1. Mark Harmon was a collegiate football star. 2. Michael Weatherly auditioned for the role of Anthony DiNozzo. 3. Cote de Pablo used to work as a waitress.

2: 4. David McCallum was a part of the original "The Man from U.N.C.L.E." 5. Pauley Perrette is a published poet. 6. Sean Murray is the stepson of Donald P. Bellisario.

3: 7. Sasha Alexander learned Italian for her role as Kate Todd. 8. Brian Dietzen's first appearance on the show was as an extra. 9. Rocky Carroll has a passion for directing.

4: 10. Lauren Holly had a recurring role before joining as a series regular. 11. Emily Wickersham replaced Cote de Pablo as a series regular. 12. Jennifer Esposito is a certified pilot.

5: 13. Wilmer Valderrama was a guest star before joining the main cast. 14. Duane Henry had roles in various British TV shows. 15. Maria Bello joined the cast as an NCIS therapist.

6: 16. Jamie Lee Curtis guest-starred in several episodes. 17. Jessica Steen had a recurring role in early seasons. 18. Scottie Thompson played Jeanne Benoit, Tony's love interest.

7: 19. Alimi Ballard appeared as a forensic specialist. 20. Muse Watson played Gibbs' mentor turned foe. 21. Lauren Stamile portrayed a love interest for Gibbs.

8: 22. Sarah Jane Morris starred as an NCIS agent. 23. Jessica Collins played a Navy Lieutenant turned murder suspect. 24. Colin Hanks guest-starred as a Department of Defense investigator.

9: 25. Michael Nouri played Ziva David's father. 26. Richard Schiff appeared as Special Agent Kilbride. 27. Robert Wagner guest-starred as Anthony DiNozzo Sr.

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