NCIS showrunner Steven D. Binder has addressed the long-standing mystery of why Timothy McGee (Sean Murray) and his wife Delilah Fielding’s (Margo Harshman) twins have never made a physical appearance in the series. There has been a lot of speculation about the McGee twins, Morgan and Johnny, despite their birth in season 15, episode 9, “Ready or Not.” The episode aired in 2017, and they have not been present as of NCIS season 22.