Origins episode “The Edge” are ahead! NCIS: Origins Season 2’s third episode shed a lot of light on Dr. Donald “Ducky” Mallard, like why he talks to bodies, why he calls Leroy Jethro Gibbs by his middle name,

Harmon will return in the flesh for a special crossover event on Tuesday, Nov. 11. For one night only, “NCIS” and “NCIS: Origins” are swapping time slots; the spinoff will air first at 8 p.m. ET, followed by the original series.

Mark Harmon, who spent 18 seasons on "NCIS," is reprising his role as special agent Leroy Jethro Gibbs for a crossover event.

Warning: SPOILERS for the NCIS: Sydney episode “Lost in Translation” are ahead!

"Great News" and "Mixology" alum Adam Campbell told UPI he was honored to reprise his "NCIS" character on this week's episode of the show's "Origins" prequel.

Origins would deliver its own tribute to fan-favorite Donald “Ducky” Mallard, it was hard to know what to expect from this venture or whether Adam Campbell could reprise the role in a way that aligned with this spinoff.

However, that doesn’t mean the episode that just finished airing on the 2025 TV schedule was just your run-of-the-mill case of the week. “The Sound and the Fury” brought back NCIS Special Agent Dale Sayer for a spooky night case that ended with me wondering if there’s something deeper brewing between Nick Torres and Jessica Knight.

NCIS: Origins revealed more of the backstory of Special Agent Leroy Gibbs ( Austin Stowell) and NIS medical examiner Dr. Donald “Ducky” Mallard ( Adam Campbell) on tonight’s episode, and it was a surprise how much Gibbs’ friendship meant to Ducky and how little of it Gibbs remembered.