All 111 actors in both 9-1-1: Lone Star and Grey's Anatomy
111 actors have appeared in both 9-1-1: Lone Star and Grey's Anatomy, across 539 episodes. The most-credited is Mark Saul, Augie Thomas in 9-1-1: Lone Star and Dr. Steve Mostow in Grey's Anatomy.
| Actor | In 9-1-1: Lone Star | In Grey's Anatomy | Eps | Eps |
|---|---|---|---|---|
| Mark Saul | Augie Thomas | Dr. Steve Mostow | 1 | 36 |
| Derek Webster | Charles Vega | Paul Anderson | 12 | 1 |
| D.B. Woodside | Reverend Trevor Parks | Marcus King | 9 | 1 |
| Michelle C. Bonilla | Sara Ortiz | Dr. Elena Chavez | 9 | 1 |
| Rebecca Field | Joy | Sabine McNeil | 1 | 7 |
| Amy Acker | Catherine Harper | Dr. Kathleen Shepherd | 6 | 1 |
| Jack Conley | Captain Jack Tatum | Jasper Hovey | 4 | 1 |
| Amanda Payton | Asha Fulton | Dr. Daphne Lopez | 4 | 1 |
| Kyle Secor | Alden Radford | John Dickinson | 4 | 3 |
| Andy Favreau | Pearce Risher | Jack Moss | 3 | 1 |
| Cindy Drummond | Carol | Gwendolyn Yates, Louis' Wife | 2 | 2 |
| Kerry O'Malley | Wren | Jane Collins | 1 | 1 |
| Mary Kay Place | Theresa Blake | Olive "Ollie" Warner | 3 | 3 |
| Sumalee Montano | Principal Annie Crabtree | Lena McCallister | 1 | 1 |
| Brigid Brannagh | Abe's Mother | Veronica Kays | 1 | 2 |
| Tim Griffin | Bennett | Ronny O'Malley | 1 | 5 |
| Anton Starkman | Keith | Harrison Meade | 1 | 9 |
| William Allen Young | Benjamin Williams | Morris Haynes | 3 | 1 |
| Alex Quijano | Jordan | Random Guy | 1 | 1 |
| Amy Motta | Sydney Strand | Jenna Lee | 3 | 1 |
| Cleo King | Cynthia Strickland | Robin | 1 | 3 |
| Eugene Byrd | Will | Danny Ford | 1 | 1 |
| Laura Niemi | Mary-Lynne | Cynthia | 1 | 1 |
| John Posey | Cole Robertson | Aurelio Wheeler | 4 | 1 |
| Omar Leyva | Gustavo | Luis Rivera | 2 | 3 |
| Brian Letscher | Roy Griffin | Mr. Epley | 2 | 1 |
| Joshua Bitton | Police Officer | Harry Adkins | 2 | 1 |
| Elizabeth Ho | Therapist | Molly | 1 | 1 |
| Hayley Chase | Sharon | Cassidy Gardner | 1 | 1 |
| Jim Ortlieb | Frank | Jack O'Brien | 1 | 1 |
| Lauren Bowles | Joanne Polson | Alice Franklin | 1 | 1 |
| Matthew Alan | Mr. Conrad | David Fisher | 1 | 1 |
| Rhomeyn Johnson | Security Officer Maxwell | Manager | 2 | 2 |
| Robert Pine | Walter Strand | Vincent | 1 | 1 |
| Veronica Diaz-Carranza | Liza | Mercedes Hernandez | 1 | 1 |
| Todd Stashwick | Dennis Raymond | Mr. Kramer | 2 | 1 |
| Christine Weatherup | Dr. Collins | Crystal | 3 | 1 |
| Adargiza De Los Santos | Cecilia | Nadine Talbott | 1 | 1 |
| Alex Fernandez | Tom Carver | FBI Agent Heyward | 1 | 2 |
| Amy Farrington | Chief Dottie Reynolds | Mary May | 1 | 1 |
| Antonio Leon | Hazmat Captain Garcia | Detective Mitch Proust | 2 | 1 |
| David Haley | Greg | Paramedic #2 | 1 | 4 |
| Don R. Williams | Jerry Meyers | Andrew 'Andy' Billings | 1 | 1 |
| Jeffrey Doornbos | Patrick | Mitch Turner | 2 | 1 |
| John Bishop | Clint | James Carlson | 1 | 2 |
| Juliette Jeffers | Genevieve | Mary | 1 | 1 |
| June Carryl | Dr. Mary Roberts | Nurse | 1 | 1 |
| Michael Bow | Probie Barrett | Corpsman | 1 | 1 |
| Ned Vaughn | Peter Braswick | Representative for the Airline | 1 | 1 |
| Alyssa Gabrielle Rodriguez | Jessica | Phoebe Moss | 1 | 2 |
| Shaan Sharma | Julian | Omar Singh | 1 | 2 |
| Angela E. Gibbs | Sylvia | Mrs. Rollins | 1 | 1 |
| Betsy Baker | Edith Sullivan | Barb | 1 | 1 |
| Erica Piccininni | Kim | Barbara Collins | 1 | 1 |
| Geoffrey Rivas | Deputy Chief De Leon | Stu Vargas | 1 | 1 |
| Ito Aghayere | Andrea | Jackie Murphy | 1 | 1 |
| Linara Washington | Beverly Gordon | Gretchen McKay | 1 | 1 |
| Michael Reilly Burke | Mayor Adam Stanton | Mr. Finch | 1 | 1 |
| Mychala Lee | Lexi Briggs | Rosie Scott | 1 | 1 |
| Natalie Lander | Tiffany | Judith Dunn | 1 | 1 |
| Philip Shahbaz | Iman Obeidi | Arab Translator | 1 | 1 |
| Sharif Atkins | Victor | Josh Greene | 1 | 1 |
| Stacie Greenwell | Ellen | Mrs. Vanderburg | 1 | 1 |
| Alexander Neher | Derrick Humphrey | Chris Duran | 1 | 1 |
| Cory Blevins | Kevin | Surgeon #2 | 1 | 1 |
| Eva La Dare | Firefighter Amber Daniels | Police Officer #2 | 1 | 1 |
| Grace Shen | Doctor | Woman | 1 | 1 |
| Walter Perez | Ben | Russ | 1 | 1 |
| Dylan Rourke | Firefighter Trout | Tyler Hemphill | 1 | 1 |
| Ida Anderson | Female Paramedic Holly | Lady | 1 | 1 |
| J.P. Manoux | Trevor | Danny Nelstadt | 1 | 1 |
| Josh Plasse | Cooper | Chris Cleaver | 1 | 1 |
| Justin Alston | Gordon Howard | CT Tech | 1 | 1 |
| Karl T. Wright | Dr. Steven Evans | Divorce Mediator | 1 | 1 |
| Ludwig Manukian | Joseph | Bus Driver | 1 | 1 |
| Marcus Terrell Smith | Jerry | Prison Clerk | 1 | 1 |
| Sam Daly | Sgt. Patrick Hargeaves | Will Jones | 1 | 1 |
| Anton Narinskiy | Firefighter Sobek | Gunnar | 2 | 1 |
| Avery Tiiu Essex | Little Girl | Navy Sutherland | 1 | 1 |
| David Grant Wright | Reverend Tom | Mr. Burton | 1 | 1 |
| Farelle Walker | Parker's Mother | Hollie Beaton | 1 | 1 |
| Lana McKissack | Abigail | Marley Frank | 1 | 1 |
| Mark Berry | Captain Broussard | AA Member | 1 | 1 |
| Mark L. Taylor | Injured Man | Dave Buckley | 1 | 1 |
| Mia Lynn Bangunan | Gabby | Mei Li | 1 | 2 |
| Michael Sasaki | Steve | Ken Bendix | 1 | 1 |
| Robert John Brewer | Nightwatchman | Philip Walker | 1 | 1 |
| Yolanda Snowball | Janice | Physical Therapist | 1 | 1 |
| Brittany Freeth | Luisa Reyes | Nurse Yvette Bergeron | 2 | 1 |
| Karen Maruyama | Poker Buddy | Lisa Saito | 1 | 1 |
| Matt McTighe | Chuck Parkland | Vincent Wagner | 1 | 1 |
| Monica Garcia | Patricia | Peds Nurse | 1 | 1 |
| Scott Allen Rinker | Hank | Toby | 1 | 1 |
| Brian Houtz | Hotel Manager | Resident | 1 | 1 |
| David Chan | Bystander | Mr. Madera | 1 | 1 |
| Matthew Downs | Sergeant Davies | Frank | 1 | 1 |
| Curtis Edward Jackson | Paramedic Sheets | Tim | 1 | 1 |
| John Bain | Collin Hall | Savant Interviewee | 1 | 1 |
| Nelson Grande | Firefighter | Firefighter Sam | 1 | 1 |
| Sharon Omi | Jane | Worried Tenant | 1 | 1 |
| Timothy E. Goodwin | Franklin | Len | 1 | 1 |
| Garon Grigsby | Thomas | Keith | 1 | 2 |
| Marcelle LeBlanc | Hilary | Georgia Arkins | 1 | 1 |
| Paris Perrault | Molly Savard | Tess | 1 | 1 |
| Tahmus Rounds | Farmer | Harry | 1 | 1 |
| Zeke Alton | Journalist | Officer Almeida | 1 | 1 |
| Tiffany Phillips | Ingrid | Anchorwoman | 1 | 1 |
| Cameron Edward Gayden | Benny | Frank | 1 | 1 |
| Rob Mainord | Mr. Potts | Procurement Surgeon | 1 | 1 |
| Raff Anoushian | Mark | Cabbie | 1 | 1 |
| Mark Anthony Williams | Jailer | Dr. James Shulman | 1 | 1 |
← 9-1-1: Lone Star × Grey's Anatomy
Cast data from TVmaze, licensed CC BY-SA 4.0.