Polly Perrette’s exit from NCIS in 2018 shocked fans, with the official reason being her character’s resignation after an assassination attempt. However, reports suggest a behind-the-scenes clash with series lead Mark Harmon played a significant role. The tension reportedly began in 2016 when Harmon’s dog bit a crew member. In her final episode, Perrette and Harmon didn’t share the screen. Her departure was creatively handled as Abby bid farewell through a letter. Perrette’s cryptic tweets post-exit hinted at workplace issues, with CBS later confirming they addressed her concerns. Despite fan hopes, Perrette stated on Twitter in 2019 that she would never return to NCIS. After retiring from acting in 2020, she remains unlikely to make a comeback to the long-running series. The backstage drama adds to a history of challenges on the NCIS set, including Sasha Alexander’s exit due to demanding schedules during the show’s second season.