NCIS 20x16 "Butterfly Effect" Season 20 Episode 16 Promo Trailer HD - The NCIS team jumps into motion to investigate who is responsible for a potential bio terror attack at a strip mall parking garage. Also, Knight’s father deals with a health scare while in Japan, on the CBS Original series NCIS, Monday, March 13th on CBS and available to stream live and on demand on Paramount+.