For over two decades, NCIS has been running wild on CBS with a seemingly infinite loop of syndication reruns on USA Network. At present, the flagship series is grinding through its 21st round with much more to come. That includes a Ziva and Tony spin off as well as the NCIS: Origins series, which will take the audience back to the early days of Leroy Jethro Gibbs’ investigative career. NCIS: Sydney remains fairly fresh, and we’re not even touching the other three city-specific spin offs at the moment because we are here to talk about Abby Sciuto.