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Gibbs And Callen! DiNozzo And Deeks! Epic NCIS Crossovers

Chris O'Donnell and Mark Harmon walking on the beach

The murder of a Marine sends Gibbs (Mark Harmon, right) to Los Angeles for a joint investigation with Special Agent G. Callum (Chris O'Donnell, left).

Photo: Cliff Lipson/CBS

When worlds collide—Watch rounds up six of our favorites.

By Nate Millado

The NCIS universe has expanded in the past 18 years—most recently with NCIS: Hawaii—and it's been a blast watching our favorite agents get to play in the same sandbox! These crossover events have treated fans to some pretty epic episodes and inspired pairings. Here's a look back at a few of our faves.

Watch NCIS on Mondays at 9 PM, ET/PT on CBS and streaming on Paramount+.

Watch NCIS: Los Angeles on CBS and streaming on Paramount+.

Stream NCIS: New Orleans episodes on Paramount+.

"Legend" and "Legend: Pt. II" (NCIS)

LL COOL J shouts into his phone while holding a bloodied and unconscious Chris O'Donnell

Sam (LL COOL J, left) rushes to Callen's (Chris O'Donnell, right) side after he is shot by an unknown gunman.

Photo: Danny Feld/CBS

Special Agent Leroy Jethro Gibbs (Mark Harmon) heads to the City of Angels and teams up with his counterparts at the NCIS Office of Special Projects to investigate the death of a Marine—only to uncover a terrorist cell rooted somewhere in downtown L.A. This NCIS two-parter introduced us to the dynamic duo of Sam Hanna (LL COOL J) and G. Callen (Chris O'Donnell). This pair would go on to headline the first NCIS spinoff, NCIS: Los Angeles.

"Random On Purpose" (NCIS: Los Angeles)

Pauley Perrette and Eric Beal having a drink

Abby (guest star Pauley Perrette) drops by NCIS: Los Angeles. Here with Eric Beal (Barrett Foa).

Photo: Sonja Flemming/CBS.

After a Naval engineer is murdered, Abby (Pauley Perrette) notices a pattern linking this case to others—so she heads to Los Angeles to warn the team of the Phantom serial killer.

"Crescent City Pt. I" and "Crescent City: Pt. II" (NCIS/NCIS: New Orleans)

Mark Harmon and Scott Bakula lean on a wrought iron railing in New Orleans

Gibbs (Mark Harmon, left) and NCIS Special Agent Dwayne Cassius Pride (Scott Bakula, right) chase leads in New Orleans after evidence points to a copycat killer.

Photo: Skip Bolen/CBS

Gibbs (Mark Harmon) and NCIS Special Agent Dwayne Cassius Pride (Scott Bakula, right) are on the tail of a copycat of the infamous Privileged Killer in New Orleans, while Pride's NCIS: New Orleans team heads to Washington, D.C. to investigate potential political connections to the case.

"Blame It On Rio" (NCIS: Los Angeles)

Eric Christian Olsen with Bobby Lee and Michael Weatherly holding guns in a warehouse

NCIS Special Agent DiNozzo (Michael Weatherly) partners with the NCIS: Los Angeles team to search the city after his prisoner escapes custody on a flight from Singapore to Los Angeles

Photo: Neil Jacobs/CBS

D.C.-based agent DiNozzo (Michael Weatherly) partners with the L.A. team to search the city after his prisoner escapes custody on a flight from Singapore to Los Angeles. DiNozzo and Marty Deeks hilariously try to one-up each other throughout the episode, proving exactly why NCIS fans love these crossovers!

"Sister City, Parts I and II" (NCIS/NCIS: New Orleans)

\u200bMichael Weatherly in a raincoat over a jacket and tie next to Pauley Perrette in a polka dot coat holding a black umbrella

Michael Weatherly and Pauley Perrette

Photo: Bill Inoshita/CBS

After the passengers and crew of a private plane traveling from New Orleans to Washington D.C. are lethally poisoned, all signs point to the missing chef—Abby's brother, Luca (Tyler Ritter). Gibbs and the D.C. team work with Pride and the New Orleans crew to locate Luca and determine why a private tech company was targeted.

"Pandora's Box, Parts I and II" (NCIS/NCIS: New Orleans)

Scott Bakula stands next to Vanessa Ferlito and Wilmer Valderrama in a brick building

In this two-part crossover event, the NCIS gang teams up to track a stolen terror playbook. Pictured: Scott Bakula as Special Agent Dwayne Pride, Vanessa Ferlito as FBI Special Agent Tammy Gregorio, and Wilmer Valderrama as NCIS Special Agent Nick Torres.

Photo Credit: Skip Bolen/CBS.

Crossovers are always a rollicking good time, and this Mardi Gras–themed conclusion to an NCIS two-parter is no exception! NCIS agents McGee (Sean Murray) and Torres (Wilson Valderrama) travel to New Orleans to partner with Pride and his team in the search for a missing homeland security theoretical terror playbook.

Watch NCIS on Mondays at 9 PM, ET/PT on CBS and streaming on Paramount+.

Watch NCIS: Los Angeles on CBS and streaming on Paramount+.

Stream NCIS: New Orleans episodes on Paramount+.

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