All 64 actors in both 9-1-1 and Young Sheldon
64 actors have appeared in both 9-1-1 and Young Sheldon, across 284 episodes. The most-credited is London Cheshire, Robert Nash Jr in 9-1-1 and Marcus in Young Sheldon.
| Actor | In 9-1-1 | In Young Sheldon | Eps | Eps |
|---|---|---|---|---|
| London Cheshire | Robert Nash Jr | Marcus | 3 | 4 |
| Drew Powell | David Cohen | Roy | 1 | 3 |
| Rob Brownstein | Dr. Burman | Malcolm Green | 1 | 1 |
| Wallace Langham | Brian | Dr. Edward Pilson | 1 | 1 |
| Zuleyka Silver | Nora Perez | Selena | 1 | 2 |
| Frank Collison | Sam | Chet | 1 | 1 |
| Jason Kelley | Patrick | Moving Guy | 1 | 1 |
| Jonney Ahmanson | Charred Car Owner | Bruce | 1 | 1 |
| Karen Malina White | Avery Webber | Officer Larson | 1 | 1 |
| S. Zylan Brooks | Hospital Staffer | Nancy | 1 | 1 |
| Brielle Barbusca | Cooper | Cheerleader | 2 | 1 |
| Jared Wernick | Craig Ellis | Clark | 1 | 1 |
| Kevin Stidham | Brother Isaac | Waiter | 1 | 1 |
| Krishna Smitha | Zainab | Woman | 1 | 1 |
| Kurt Scholler | City Official | Stan | 1 | 1 |
| Alan Heitz | Leprechaun | Edgar | 1 | 1 |
| Brandee Steger | Stacy | Dr. Bell | 1 | 1 |
| Corey Mendell Parker | Foreman | Customer | 1 | 1 |
| Greg Bryan | Watch Commander | Phil | 1 | 1 |
| J.D. Walsh | Officer Gerrard | Reverend Travis Lemon | 1 | 1 |
| Patricia Belcher | Neighbor | Clara | 1 | 1 |
| Pilar Holland | Uniformed Officer | Gloria | 1 | 1 |
| Sonya Leslie | Principal Summers | Rhonda | 1 | 1 |
| Todd Giebenhain | Dean | Dennis | 1 | 1 |
| Tom Virtue | Tire Store Employee | Father Donovan | 1 | 1 |
| Audrey Wasilewski | Joan Wallace | Joann | 1 | 1 |
| Harrison Xu | Hiro | Paul | 1 | 1 |
| Heather Olt | Social Worker, Val | Waitress | 2 | 1 |
| John Eddins | Charlie Yates | Paramedic | 1 | 1 |
| John Rubinstein | Melvin | Rabbi Schneiderman | 1 | 1 |
| Josh Latzer | Garbage Man #2 | Hank | 1 | 1 |
| Livia Treviño | Property Manager | Paula | 1 | 1 |
| Samantha Cutaran | Female Uni Cop | Girl #1 | 1 | 1 |
| Terryn Westbrook | Nancy Cook | Jackie | 1 | 1 |
| Travis Schuldt | Sam Egan | Justin | 1 | 1 |
| LaNisa Renee Frederick | Kath, Mom | Cashier | 2 | 1 |
| Alfred Woodley | Captain Roose | Shawn | 1 | 1 |
| Anthony M. Bertram | Larry | Officer Smith | 1 | 1 |
| Gabriel Burrafato | Hugh Foster | Ken | 1 | 1 |
| Jill Lover | Kelsey Landis | Woman in Crowd | 1 | 1 |
| Mauricio Lara | Dean | Ricky | 1 | 1 |
| Nolan Bateman | Tony Bryson | Keith | 1 | 1 |
| Troy Blendell | Bernie | Phil Lambert | 1 | 1 |
| Andy Umberger | Deputy Chief Phil Evans | Mr. Anderson | 1 | 1 |
| Asante Jones | Jack Tannor | Chip | 1 | 1 |
| Brandon Morales | Raymond Dykstra | Referee | 1 | 1 |
| Jaxy Boyd | Brenda | Prayer Group #5 | 1 | 1 |
| Jo-Ann Pantoja | Female Firefighter #1 | Woman | 1 | 1 |
| Michelle Meredith | Holly | Wendy | 1 | 1 |
| Nikea Gamby-Turner | Doctor | Florence | 1 | 1 |
| Shane Blades | Tom | Actor #2 | 1 | 1 |
| Stewart Skelton | Minister | Dr. Adams | 1 | 1 |
| Jim Hanna | St. Patrick | Dr. Hayes | 1 | 1 |
| Kevin D'Arcy | Harrison | DMV Employee | 1 | 1 |
| Lyn Alicia Henderson | Social Worker | Sally | 1 | 1 |
| Raphael Vargas Chestang | Clerk | Robert | 1 | 1 |
| Bob Rumnock | Artie | Older Man | 1 | 1 |
| Kiva Jump | Lisa | Daisy | 1 | 1 |
| Martin Garcia | City Lawyer | Mr. Nelson | 1 | 1 |
| Becki Dennis | Music Teacher | Employee | 1 | 1 |
| Karen Y. McClain | Victoria | Doreen | 1 | 1 |
| Wiley Pickett | Captain Cooks | FBI Agent #1 | 1 | 1 |
| Daniele Lawson | 16-Year-Old Julia | Shelby | 1 | 1 |
| Timothy E. Goodwin | Fat Guy | Shifty Fellow | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.