Warning: SPOILERS for the NCIS : Origins episode “The Edge” are ahead!

Today’s been a big day for NCIS: Origins fans. First, it was announced that Mark Harmon will appear on camera on Origins during its half of the upcoming crossover with NCIS , the first time he’s done so since the prequel series began in October 2024 . Hours later, “The Edge,” which just finished airing on the 2025 TV schedule , brought back Adam Campbell as the younger version of Donald “Ducky” Mallard , whom we’d previously seen in four NCIS episodes.

Origins Season 2’s third episode shed a lot of light on the character, including why he calls Leroy Jethro Gibbs by his middle name (he reminds him of the agriculturist Jethro Tull) and how he unintentionally inspired Gibbs’ boat-building hob

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