The February 2024 premiere of “NCIS” Season 21 brings together a blend of familiar characters and fresh faces. Sean Murray reprises his role as Timothy McGee, while Wilmer Valderrama returns as Nick Torres. This season marks a poignant moment with the absence of David McCallum, who passed away in 2023. His enduring legacy on the show is deeply felt by fans and the cast alike, highlighting his significant contribution to the series over the years.