All 100 actors in both NCIS and Young Sheldon
100 actors have appeared in both NCIS and Young Sheldon, across 649 episodes. The most-credited is Brian Stepanek, Karl Chunk in NCIS and Hubert Givens in Young Sheldon.
| Actor | In NCIS | In Young Sheldon | Eps | Eps |
|---|---|---|---|---|
| Brian Stepanek | Karl Chunk | Hubert Givens | 1 | 22 |
| Nancy Linehan Charles | Ruthann Harrison | Peg | 1 | 19 |
| Bob Newhart | Doctor Walter Magnus | Professor Proton | 1 | 3 |
| Carlease Burke | D'Arcy McKinna | Mrs. Ebner | 3 | 1 |
| Leonard Robinson | Metro Police Officer Jackson | FBI Agent #2 | 2 | 1 |
| Katherine Von Till | Pamela Juventas | Anchor, Kimberly, Local TV Newscaster | 1 | 7 |
| Jackie Geary | NCIS Agent Susan Grady | Ann | 3 | 1 |
| Asante Jones | Homicide Detective Andy Kochofis | Chip | 2 | 1 |
| Rick Peters | Vincent Maple | Mr. Boggs | 2 | 1 |
| Vernée Watson | Miss Helen Frimkes | Nurse Robinson | 1 | 2 |
| Drew Powell | Fred Hadley | Roy | 1 | 3 |
| Nick Alvarez | Jonny | Derek | 1 | 5 |
| Amanda Payton | Misty Boxlarter | Meredith | 1 | 1 |
| Dave Florek | Virgil McKeever | Dr. Eberland | 1 | 2 |
| Dennis Cockrum | NSA Tech, Senator | Mr. Stover | 2 | 1 |
| Jim Beaver | Captain Tom O’Rourke | Kenneth | 1 | 1 |
| Larry Cedar | Jason Kaplan | Lawrence | 1 | 1 |
| Marla Gibbs | Rosie Brown | Doris | 1 | 1 |
| Rob Brownstein | Wayne Gordon | Malcolm Green | 1 | 1 |
| Rocky McMurray | Howard County P.D. Officer Ray Mitchell | Judge Landry | 1 | 1 |
| Stephanie Hodge | Greta Ford, Sheriff Charlene Dupray | Pat | 2 | 1 |
| Tim Griffin | Marine Sgt. Malcolm Porter | Clint Watson | 1 | 1 |
| Todd Giebenhain | Leo Vairo | Dennis | 1 | 1 |
| Travis Schuldt | Freddy Martin, Paul Miller | Justin | 2 | 1 |
| Jason Rogel | Leo | Nigel | 1 | 2 |
| Pilar Holland | Colonel Lucia Campbell | Gloria | 2 | 1 |
| Cedric Begley | Blake | Doug | 1 | 1 |
| Cleo King | Della Robinson | Mrs. Costello | 1 | 1 |
| Eileen Galindo | Evelyn Gomez | Mrs. Howard | 1 | 1 |
| Jason Kelley | Marine Master Sergeant Ramsey Dillon | Moving Guy | 1 | 1 |
| Krishna Smitha | Dr. Carrie Moran | Woman | 1 | 1 |
| Livia Treviño | Lupe | Paula | 1 | 1 |
| Oliver Muirhead | Jay Danorth | Dr. Van Doornewaard | 1 | 1 |
| Ramiz Monsef | Mitchell Young | Dr. Patel | 1 | 1 |
| S. Zylan Brooks | Catherine Scott | Nancy | 1 | 1 |
| Shane Blades | Tony | Actor #2 | 1 | 1 |
| Sonya Leslie | Nancy | Rhonda | 1 | 1 |
| Tom Yi | Harold | Dr. Kwok | 1 | 1 |
| Adam Kulbersh | Alan Katzenbach | Fred Murphy | 1 | 1 |
| Alan Rachins | Bud | Vern | 1 | 1 |
| Chris Ellis | Gunnery Sgt. John Deluca | Marty Steinbecker | 1 | 1 |
| Eddie Shin | CGIS Special Agent Kyle Omagi | Mr. Stevens | 1 | 1 |
| Gregg Binkley | Bob Stivers | Eric | 1 | 1 |
| Kurt Scholler | Steve Mehlman | Stan | 1 | 1 |
| Mark L. Taylor | Dr. Harvey Kimball | Lyndon | 1 | 1 |
| Robert Picardo | Retired Marine Gunnery Sergeant Dale Harding | Professor Salzman | 1 | 1 |
| Stacie Greenwell | Hartford County Sheriff Marge Fields | Helen | 1 | 1 |
| Terryn Westbrook | County Deputy Regina Unger | Jackie | 1 | 1 |
| Tony Winters | Admiral Gene Halverson | Conductor | 1 | 1 |
| Troy Blendell | Bernard Wilson | Phil Lambert | 1 | 1 |
| Winston Story | Manny | Nelson | 1 | 1 |
| Audrey Wasilewski | Shirley Wilkes | Joann | 1 | 1 |
| Benjamin Stockham | Henry Marshall | Preston | 1 | 1 |
| Corey Mendell Parker | Metro Police Officer Bilik | Customer | 1 | 1 |
| Emily Berry | Gladys | Janice | 1 | 1 |
| Frank Gallegos | Pete | Frank | 1 | 1 |
| Gabriel Burrafato | Reverend Edward Pike | Ken | 1 | 1 |
| Gerald Downey | Navy Cmdr. Ray Trapp | Jim | 1 | 1 |
| Greg Bryan | Donald Burke | Phil | 1 | 1 |
| J.D. Walsh | Leonard Finnik | Reverend Travis Lemon | 1 | 1 |
| Jason Kravits | Doctor Gordon Roth | Dr. Ronald Hodges | 1 | 1 |
| John Rubinstein | Bob | Rabbi Schneiderman | 1 | 1 |
| LaNisa Renee Frederick | Diana Roday | Cashier | 1 | 1 |
| Paul Schackman | Sullivan Brady | Mr. Lockhart | 1 | 1 |
| Phil Morris | Navy Capt. Paul Martino | One | 1 | 1 |
| Tom Virtue | Frank Satner | Father Donovan | 1 | 1 |
| Yeniffer Behrens | Marta Jimenez | Teresa | 1 | 1 |
| Anjali Bhimani | Samantha Petrie | Zero | 1 | 1 |
| Derrick McMillon | Lt. Scott Bowen | Hal | 1 | 1 |
| Heather Olt | Groundskeeper | Waitress | 1 | 1 |
| Jaxy Boyd | Michelle | Prayer Group #5 | 1 | 1 |
| Jeremy Guskin | Roland Kesta | Andy | 1 | 1 |
| Jim Meskimen | Doctor Farrel Emerson | Dr. Nicholson | 1 | 1 |
| Josh Latzer | Olek Lazarenko A.K.A. Man | Hank | 1 | 1 |
| Judith Drake | Delores | Mildred | 1 | 1 |
| Karly Rothenberg | Female Passerby | Mrs. Veazey | 1 | 1 |
| Lyn Alicia Henderson | ER Nurse | Sally | 1 | 1 |
| Patrick Cox | Parking Enforcement Officer Carl Bjork | Marty | 1 | 1 |
| Scott Peat | Mitchell Grafton | Gerome | 1 | 1 |
| Zakary Shawn Risinger | Hurley | Danny | 1 | 1 |
| Daniel Polo | Parker Ryan | Mr. Ziegler | 1 | 1 |
| Deb Hiett | Navy Chief Laura Ramirez | Susan | 1 | 1 |
| Hermie Castillo | Zeke | Toby | 1 | 1 |
| John Eddins | Steve | Paramedic | 1 | 1 |
| Kevin Will | Will Sutton | Lucas | 1 | 1 |
| Sara Sanderson | Tiffany | Leslie | 1 | 1 |
| Stephanie Escajeda | Natalia | Betty | 1 | 1 |
| Bryce McBratnie | Chet | Elliot | 1 | 1 |
| Chris Flanders | Joseph McBride | Gary | 1 | 1 |
| Hilda Boulware | Madam Foreperson | Judy | 1 | 1 |
| Sarah Jane MacKay | Rose | Sally | 1 | 1 |
| Timothy Davis-Reed | Edison Rawls | Jerry | 1 | 1 |
| Andy Umberger | FBI Agent Freedman | Mr. Anderson | 1 | 1 |
| Jeff Pride | Car Owner | Bob | 1 | 1 |
| Melody Butiu | Patricia Richert | Mrs. Jameson | 1 | 1 |
| Christopher Carrington | Navy Seaman Ronald "Ronny" T. Jones | Dealer | 1 | 1 |
| Kate Fuglei | Delores Bromstead | Woman with Bag | 1 | 1 |
| Kirk Bovill | Richard Sims | Actor #1 | 1 | 1 |
| Paul Mabon | Lucas' Father | Clayton | 1 | 1 |
| Wiley Pickett | Navy Captain David Wade | FBI Agent #1 | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.