NCIS is undergoing significant changes, including Mark Harmon’s departure and concerns surrounding Wilmer Valderrama’s character. While there were rumors about Rocky Carroll leaving, he remains on the show as Director Vance. Timothy McGee’s role has sparked speculation about him potentially succeeding Vance. Pauley Perrette’s return is uncertain due to retirement and health challenges. The 20th season premiered with lower ratings, possibly influenced by Harmon’s exit. Despite uncertainties about its future, fans are urged to continue supporting the show.