All 74 actors in both NCIS and Westworld
74 actors have appeared in both NCIS and Westworld, across 544 episodes. The most-credited is Demetrius Grosse, Atif Nukunda, Lieutenant Merritt Hastings in NCIS and Deputy Foss in Westworld.
| Actor | In NCIS | In Westworld | Eps | Eps |
|---|---|---|---|---|
| Demetrius Grosse | Atif Nukunda, Lieutenant Merritt Hastings | Deputy Foss | 2 | 4 |
| Louis Herthum | Ernest McCormick | Peter Abernathy | 1 | 5 |
| Jack Conley | Metro Detective Danny Sportelli | Monroe | 3 | 1 |
| Karan Oberoi | Benham Parsa | Mariposa Guest | 2 | 1 |
| Brian Howe | Sherriff Tom Barrett | Sheriff Pickett | 1 | 3 |
| James Landry Hébert | Jonesy | Slim Miller | 1 | 3 |
| Russell Wong | Special Agent in Charge Feng Zhao | Brompton | 1 | 3 |
| Alastair Duncan | Peter Velo, Ron Davenport | Cottage Father | 2 | 1 |
| Patrick Cage | Taye Tanner | Phil | 1 | 3 |
| Arturo Del Puerto | Edward 'Collarbone' Rosario | Hugo | 1 | 1 |
| Chris Browning | NCIS REACT Supervisory Special Agent Tom Dalton | Holden | 1 | 2 |
| Eddie Shin | CGIS Special Agent Kyle Omagi | Henry | 1 | 3 |
| Louis Ferreira | Harlan Atwood, Metro Detective Nick Burris | Dr. Alpert | 2 | 1 |
| Travis Hammer | Faux County Deputy Randall Sledge | Leering Guest | 1 | 1 |
| Iddo Goldberg | Yaniv Bodnar | Sebastian | 1 | 3 |
| Erica Luttrell | Allison Asher | New Mother | 1 | 2 |
| Johnny Wactor | Navy Lieutenant Ross Johnson | Gunny Thompson | 1 | 2 |
| Ronnie Gene Blevins | Ronald Nowakowski | Engels | 1 | 2 |
| Wayne Péré | Stanley Springer | Therapist | 1 | 2 |
| Cherise Boothe | Marine Officer Washington | Temperance Maeve | 1 | 1 |
| Jonathan Medina | Navy Commander Ted Morgan | QA Responder | 1 | 1 |
| Kate Rene Gleason | Jane | Surveillance Tech | 1 | 3 |
| Nanrisa Lee | Inspector General Regina Ward | Narrative Tech | 1 | 1 |
| Fredric Lehne | Captain Graves | Colonel Brigham | 1 | 2 |
| Ward Roberts | Pilot | New Walter | 1 | 3 |
| Bradley Snedeker | Petty Officer Carnahan | Passenger | 1 | 1 |
| Granville Ames | Hank | Union Recruiter | 1 | 1 |
| José Zúñiga | Navy Capt. Dr. Adrian De La Casa | Vice President | 1 | 1 |
| Josh Randall | Navy Commander Ryan Barnes | Jim Navarro | 1 | 2 |
| Lena Georgas | Doctor Deena Bashan | Lori | 1 | 2 |
| Mataeo Mingo | Lucas | Boy of 8 | 1 | 1 |
| Matthew Hancock | Geoffrey Sullivan | Husband | 1 | 1 |
| Michele Boyd | Navy Chief Petty Officer Emily Ross | Temperance Armistice | 1 | 1 |
| Sherman Augustus | Marine Cpt. Daniel Lemay | Marshal Pruitt | 1 | 1 |
| Brian Ames | Matthew Duques | Jacobson | 1 | 2 |
| Gabriel Sousa | Jared | Alpha Bro | 1 | 2 |
| Al Coronel | Metro P.D. Lieutenant Wilton Buck | President Adrian Filo | 1 | 1 |
| Emmie Nagata | NCIS REACT Special Agent Diana Ono | Wife | 1 | 1 |
| J.B. Tadena | Navy Combat Information Center Officer Lonnie Franklin | QA | 1 | 1 |
| Peter James Smith | Benjamin Harmey | Geo Tech | 1 | 1 |
| Sadie Stratton | Renee Watts | Mother | 1 | 1 |
| Trisha LaFache | Lola | Senior Tech | 1 | 1 |
| Wade Williams | Larry Purcell | Captain Norris | 1 | 1 |
| Alex Fernandez | Joseph Flores | Mora | 2 | 1 |
| Charles Remley III | Homeland Security Agent #3, Navy Chief #1 | Confederado Sergeant | 2 | 1 |
| Gilbert Chayrez-Chavarria | Male REACT Agent | Lead QA Responder | 1 | 1 |
| Scott Connors | Marine Sergeant Mitch Wilkins | Bodyguard | 1 | 1 |
| Judson Mills | Mr. Rasmussen | Deputy Roe | 1 | 1 |
| Lawrence Adimora | Navy Seaman Jacob Pierway | Second EMT | 1 | 1 |
| Regi Davis | Commander David Smith | Father of Young Boy | 1 | 1 |
| Scott Peat | Mitchell Grafton | Pardue Brother #3 | 1 | 1 |
| Dylan Kenin | Freddie Fountain | Wagon Driver | 1 | 1 |
| Geri-Nikole Love | Paramedic | Nurse #2 | 1 | 1 |
| Isaac Gonzalez Rossi | Marco | Estefan | 1 | 2 |
| Nick Massouh | Navy Chief Petty Officer Refet Ramadani | Terence Danvers (Businessman) | 1 | 1 |
| René Ashton | Justine Wolfe | Female Guest | 1 | 1 |
| Sue Cremin | Vivian Sutton | Diner Waitress | 1 | 1 |
| Alain Ali Washnevsky | Embassy Worker Jamal Antar | Broker | 1 | 1 |
| Eric Ramey | Doctor Nolan Cooper | Narrative Tech | 1 | 1 |
| Joshua Dov | Portland Douglas | Python Cowboy | 1 | 1 |
| Rob James | Guard | Sergeant | 1 | 1 |
| Tyler Parks | Navy Petty Officer Third Class Gordon Cooper | Bartender | 1 | 1 |
| Andre M. Johnson | Bailiff Colt McKinney | Officer | 1 | 1 |
| David Bianchi | Kyle Jennings | PMC #3 | 1 | 1 |
| Joshua Sawtell | Frankie Boulos | Controller | 1 | 1 |
| Sarah Jane MacKay | Rose | Woman in Ball Gown | 1 | 1 |
| Tim Fox | Navy Petty Officer Second Class Toby Withers | Burley Guest | 1 | 1 |
| Austin Priester | Navy Lt. Bryce Armstrong | Arroyo | 1 | 1 |
| Travis Johns | Martin Curtis | Python Cowboy | 1 | 1 |
| Wiley Pickett | Navy Captain David Wade | Donald Pardue | 1 | 1 |
| Alan Pietruszewski | Navy Captain Tom Zill | Commanding Officer | 1 | 1 |
| Bruno Gunn | Air Boss | Walrus | 1 | 1 |
| Chad Doreck | Leo | Shop Clerk | 1 | 1 |
| Patrick Quinlan | London Bobby | Passenger | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.