Mark Harmon is returning as Gibbs for NCIS: Origins crossover event

Mark your calendars, everyone, because Mark Harmon is officially reprising his role as Leroy Jethro Gibbs on NCIS: Origins next month.

The actor, who starred as Gibbs for over 18 seasons on NCIS, will make a special guest appearance as part of the first-ever crossover event between the flagship series and its prequel on Nov. 11. The crossover will see the younger version of Gibbs (played by Austin Stowell) and his Origins teammates investigate the death of a naval officer in the 1990s, only for the case to be unexpectedly re-opened over three decades later on NCIS.

“I’m very proud of the storytelling that David and Gina are doing on Origins,” Harmon said in a press release. “They continue to push boundaries and dive deeper into the characters’ backstories. They came to me with an idea for Gibbs that I liked, and it seemed like a good time to check in with him. I hope fans enjoy it.”