1:
1. Jessica Alba made a guest appearance on NCIS.
2. Jamie Lee Curtis starred in an episode of NCIS.
3. Joe Spano played Tobias Fornell on NCIS.
2:
4. Lily Tomlin made a cameo on NCIS.
5. Chad Michael Murray guest-starred on NCIS.
6. Jeri Ryan appeared as Rebecca Chase on NCIS.
3:
7. Michael Weatherly portrayed Tony DiNozzo on NCIS.
8. Rena Sofer played Margaret Allison Hart on NCIS.
9. Maria Bello joined the cast as Jacqueline Sloane on NCIS.
4:
10. Rick Springfield guest-starred on NCIS.
11. Scottie Thompson appeared as Jeanne Benoit on NCIS.
12. Sasha Alexander starred as Caitlin Todd on NCIS.
5:
13. Brian Dietzen plays Dr. Jimmy Palmer on NCIS.
14. Mark Harmon stars as Leroy Jethro Gibbs on NCIS.
15. Cote de Pablo portrayed Ziva David on NCIS.
6:
16. Lauren Holly guest-starred as Jenny Shepard on NCIS.
17. Michael Nouri played Eli David on NCIS.
18. Dina Meyer appeared as Holly Snow on NCIS.
7:
19. Sean Murray stars as Timothy McGee on NCIS.
20. Pauley Perrette portrayed Abby Sciuto on NCIS.
21. David McCallum played Donald Mallard on NCIS.
8:
22. Emily Wickersham portrayed Eleanor Bishop on NCIS.
23. Wilmer Valderrama joined the cast as Nick Torres on NCIS.
24. Rocky Carroll stars as Leon Vance on NCIS.
9:
25. Robert Wagner guest-starred on NCIS.
26. Sarah Clarke played Tess Monroe on NCIS.
27. Muse Watson appeared as Mike Franks on NCIS.