Credits) — Ncis Season 20 Intro (opening

Shared by David McCallum (Dr. Donald "Ducky" Mallard) and Rocky Carroll (Leon Vance). "And" Credit: Awarded to Gary Cole (Alden Parker). Audio & Visual Updates

Sean Murray and Wilmer Valderrama took over the "Previously on NCIS" voiceover line. NCIS Season 20 Intro (Opening Credits)

After Murray, the order followed with Wilmer Valderrama (Nick Torres), Katrina Law (Jessica Knight), Brian Dietzen (Dr. Jimmy Palmer), and Diona Reasonover (Kasie Hines). Special Billing: Shared by David McCallum (Dr

The iconic theme composed by Brian Kirk remained the show's musical signature. Katrina Law (Jessica Knight)