Nielsen Rating: Endgame was seen by 20.96 million people, and was rated 12.7/20 in households, 6.0/15 in adults 25-54, 4.4/12 in adults 18-49, and 3.2/10 in adults 18-34. This episode delivers this time slot's best viewers, adults 25-54 and adults 18-49. Of all the episodes of NCIS this season, every first-run episode has gotten more than 20 million viewers.