All 147 actors in both Buffy the Vampire Slayer and ER
147 actors have appeared in both Buffy the Vampire Slayer and ER, across 475 episodes. The most-credited is Abraham Benrubi, Olaf the Troll in Buffy the Vampire Slayer and Jerry Markovic in ER.
| Actor | In Buffy the Vampire Slayer | In ER | Eps | Eps |
|---|---|---|---|---|
| Abraham Benrubi | Olaf the Troll | Jerry Markovic | 2 | 137 |
| Armin Shimerman | Principal Snyder | Levine | 19 | 1 |
| Iyari Limon | Kennedy | Brenda | 13 | 1 |
| Leonard Roberts | Forrest Gates | Police Officer | 12 | 1 |
| Ken Lerner | Principal Flutie | Harry Stopak, Stan Seidel | 4 | 2 |
| Eion Bailey | Kyle | Med Student Jake Scanlon | 1 | 10 |
| Lindsay Crouse | Maggie Walsh | Dr. Anna Castiglioni | 9 | 1 |
| Stuart McLean | Philip Henry | X-Ray Tech, Mike Devore | 1 | 12 |
| Shane West | Sean | Dr. Ray Barnett | 1 | 3 |
| David Brisbin | Mr. Anderson | Dr. Alexander Babcock | 1 | 19 |
| Andrew J. Ferchland | The Anointed One | Ozzie Sheff | 6 | 1 |
| Andy Umberger | D'Hoffryn | Dr. David Harvey | 4 | 2 |
| Larry Bagby | Larry Blaisdell | Second Reporter | 6 | 1 |
| Geoff Meed | Mag, Andrew Borba | Bart, Gary Parnell | 3 | 2 |
| Jeff Kober | Rack, Zachary Kralik | Stuart | 4 | 1 |
| Skip Stellrecht | Agent Manetti | Chaplain Miller | 1 | 4 |
| Chad Lindberg | Dave | Jad Houston | 1 | 2 |
| Dagney Kerr | Kathy Newman | Hedda Lanford | 2 | 1 |
| Franc Ross | Razor | Naughton | 2 | 1 |
| Todd Duffey | Murk | Mitch | 6 | 1 |
| Brent Jennings | Absalom | Nat | 1 | 3 |
| Clea DuVall | Marcie Ross | Katie Reed | 1 | 2 |
| Conchata Ferrell | Nurse Greenliegh | Mrs. Jenkins | 1 | 1 |
| James MacDonald | Detective Stein | Officer Gary McWayne | 3 | 1 |
| Kevin Weisman | Dreg | Glenn Krakowski | 3 | 1 |
| Conor O'Farrell | Colonel McNamara | Richard Abbott | 3 | 2 |
| Ingo Neuhaus | Daryl Epps | Cop, McNally | 1 | 2 |
| Juanita Jennings | Dr. Wilkinson | ICU Doctor, Mrs. Davis | 1 | 2 |
| Michael Earl Reid | Custodian | Bennet Owens | 1 | 2 |
| Paige Moss | Veruca | Amy Stehly | 2 | 1 |
| Christine Healy | Guardian | Administrator Harriet Spooner | 1 | 3 |
| Christopher Wiehl | Owen Thurman | Mr. Lattimer | 1 | 1 |
| Michael Cudlitz | Bob | Lang | 1 | 1 |
| Nancy Lenehan | Pat | Edie Harvell | 1 | 1 |
| Richard Herd | Dr. Stanley Backer | Dr. Murphy | 1 | 1 |
| Rick Zieff | Mr. Whitmore | How Ya Doin' Guy | 1 | 1 |
| Wentworth Miller | Gage Petronzi | Mike Palmieri | 1 | 1 |
| Julia Ling | Potential with Power #2 | Med Student Mae Lee Park, Michelle | 1 | 5 |
| Jack Stehlin | Doctor Angleman | Mr. Stevens | 3 | 1 |
| Todd Thawley | Hus | Smith | 1 | 3 |
| Aldis Hodge | Masked Teen | Brad Enloe, Young Man | 1 | 2 |
| Pat Crawford Brown | Wig Lady | Mrs. Votey | 1 | 1 |
| Rick Gonzalez | Thomas | Jorge Escalona | 1 | 1 |
| Wade Williams | General Gregor | Migraine Guy | 1 | 1 |
| Bryan Cuprill | Roy | Jensen | 2 | 1 |
| Lily Knight | Gronx | Mary Cochran | 2 | 1 |
| Adam Gifford | Tough Vamp | Pelvis Man | 1 | 1 |
| Brent Hinkley | Manny | Fred Hopper | 1 | 1 |
| Charles Cyphers | Coach Marin | Injured Civil War Reenactor | 1 | 1 |
| Coby Bell | Young Man | Brett Nicholson | 1 | 1 |
| David Franco | Vamp #3 | Dominic | 1 | 1 |
| Denise Dowse | Ms. Miller | Mrs. Lysell | 1 | 1 |
| Glenn Morshower | Mr. Newton | Rick Decoyte | 1 | 1 |
| Jimmie F. Skaggs | Courier | Joe Chattarowski | 1 | 3 |
| Kathryn Joosten | Mrs. Holt | Lois | 1 | 1 |
| Leland Crooke | Professor Lillian | Bart | 1 | 1 |
| Lenora May | Mrs. Jackson | Review Board Doctor #2 | 1 | 1 |
| Mary-Pat Green | Blood Bank Nurse | Miss McDuffy | 1 | 1 |
| Pierrino Mascarino | Thelonius | Mr. Clayton | 1 | 1 |
| Steven Gilborn | Uncle Rory | Dr. Randall | 1 | 1 |
| Eric Saiet | Dalton | Alex Dibble | 2 | 1 |
| Alex Skuby | Vincent | Renato (Medivac) | 1 | 2 |
| Anne Betancourt | Principal Stevens | Mrs. Kearney | 1 | 1 |
| Brian Turk | Mort | Michaels | 1 | 1 |
| Daniel Henry Murray | Creepy Cult Guy | Med Tech | 1 | 1 |
| Dave Power | Zach | Jeremy Cranston | 1 | 1 |
| Elizabeth Penn Payne | Waitress | Margie | 1 | 1 |
| Frederick Dawson | Porter | Bus Driver | 1 | 1 |
| John Hawkes | George | P.A. | 1 | 1 |
| Julie Fulton | FBI Teacher | Swanson | 1 | 2 |
| Justin Doran | Hogan | Jay, Student #2 | 1 | 2 |
| Keram Malicki-Sánchez | Freddy | Rick | 1 | 1 |
| Megalyn Echikunwoke | Vawn | Terry Welch | 1 | 1 |
| Michael Manasseri | Horned Demon | Michael Kenny | 1 | 1 |
| Nicole Bilderback | Cordette #1 | Claire | 1 | 1 |
| Robert Mont | Van Driver | Animal Control Cop | 1 | 1 |
| Steven M. Porter | Jack | Mr. Pularski | 1 | 1 |
| Suzanne Krull | Clerk | Mary Grant | 1 | 1 |
| Terry Walters | Ms. Tishler | Mrs. Angevine | 1 | 1 |
| Time Winters | Initiative Doctor | Emil Savka | 1 | 1 |
| Vaughn Armstrong | Cop | Greg Mitchell | 1 | 1 |
| Will Rothhaar | James | Robert "Bo" Borsalino | 1 | 1 |
| Cynthia LaMontagne | Lydia | Paula McKenzie | 2 | 1 |
| Brooke Bloom | Nicole | Quinn | 1 | 1 |
| Carlease Burke | Detective Winslow | Policewoman | 1 | 1 |
| Christian Clemenson | Balthazar | Dr. Kurtag | 1 | 1 |
| Justin Urich | Wendell | Corky | 1 | 1 |
| Michael Emanuel | Burly Guard | Homer Grant | 1 | 1 |
| Richard Hoyt Miller | Policeman | Battalion Chief | 1 | 1 |
| Rif Hutton | Initiative Leader | Mr. Royston | 1 | 1 |
| Rock Reiser | Desk Sergeant | Mr. Dupont | 1 | 1 |
| Steven Anthony Lawrence | Chunky Kid | John Thomas Frum | 1 | 1 |
| Tom Kiesche | Vampire | Officer Monroe | 1 | 1 |
| Zachery Ty Bryan | Peter | Upsilon Psi Lambda Frat Brother | 1 | 1 |
| Darris Love | Hallmate | Hudson, Man in Jail | 1 | 2 |
| Beth Skipp | Lulu | Mrs. Urman | 1 | 1 |
| Caroline Lagerfelt | Anne | Andrea | 1 | 1 |
| Charles Duckworth | Glenn | Mikey | 1 | 1 |
| Denise Johnson | Celia | Emma Pomerantz | 1 | 1 |
| Douglas Bennett | Phillip | Martin | 1 | 1 |
| Jessica Townsend | Cheryl | Alice Jenkins | 1 | 1 |
| John Bellucci | Man | Father | 1 | 1 |
| Kal Penn | Hunt | Narajan | 1 | 1 |
| Lorna Scott | Miss Beakman | Stan's Wife | 1 | 1 |
| Michael J. Harney | Xander's Father | Mr. Stehly | 1 | 1 |
| Sean Moran | Stage Manager | Mr. Blinker | 1 | 1 |
| Terence Bernie Hines | Shop Keeper | Felton | 1 | 1 |
| Whitney Dylan | Lysette | Laura Becton | 1 | 1 |
| Adam Lieberman | Carl | Levine | 1 | 1 |
| Damani Roberts | Young Robin | Sammy | 1 | 1 |
| Darius Dudley | Minister | Clyde | 1 | 1 |
| Harrison Young | Old Man | Parmelli | 1 | 1 |
| Jane Cho | Nurse #1 | Fong | 1 | 1 |
| Natasha Pearce | Lisa | Moselle | 1 | 1 |
| Patricia Place | Woman | Mrs. Romero | 1 | 1 |
| Richard Riehle | Merrick | Mandrake Patient | 1 | 1 |
| Lance E. Nichols | Middle-Aged Man | Detective Barnes | 1 | 2 |
| Mark Elliott Silverberg | Passing Student | Med Student Urbanus | 1 | 2 |
| Debbie Lee Carrington | Creature | Ginger Jones | 1 | 1 |
| Jack McGee | Doug Perren | Rodney McMullen | 1 | 1 |
| Jarrett Lennon | Martin Wilder | Billy | 1 | 1 |
| Mark Ankeny | Dean Guerrero | Electrician | 1 | 1 |
| Norma Michaels | Older Woman | Rose Franklin | 1 | 1 |
| Rae'Ven Larrymore-Kelly | Lisa | Monique | 1 | 1 |
| Robert Covarrubias | Caretaker | Manny Lopez | 1 | 1 |
| Tom Bailey | Tree Seller Guy | Sgt. Larkowski | 1 | 1 |
| Barbara Whinnery | Mrs. Anderson | Mrs. Draper | 1 | 1 |
| John Rosenfeld | Vamp Lackey #2 | FBI Agent Robert Clayton | 1 | 1 |
| Robert Noble | Night Manager | Santa | 1 | 1 |
| Jay Michael Ferguson | Another Student | Gary | 1 | 1 |
| Larry Clarke | Monk | Male Lawyer | 1 | 1 |
| Mike Rad | Rookie | Delivery Man | 1 | 1 |
| Thomas Bellin | Dr. Gold | Wilson Wolfe | 1 | 1 |
| Ace Mask | Professor Roberts | Korth | 1 | 1 |
| Alexandra Lee | Young Buffy | Katie | 1 | 1 |
| Dell Yount | Truck Guy | Mazanski | 1 | 1 |
| Megan Vint | Karen | Morgan Brenner | 1 | 1 |
| Dom Magwili | Doctor | Trauma Surgeon | 1 | 1 |
| Wayne Sable | Freshman | Student #12 | 1 | 1 |
| David Grammer | Crazy Citizen | Clerk | 1 | 1 |
| Ally Matsumura | Japanese Girl | Missy | 1 | 1 |
| Ashleigh Ann Wood | Sara Age 18 | Fiona | 1 | 1 |
| Anil Raman | Earnest Fellow | Cashier | 1 | 1 |
| Andrew Cooper Wasser | Slime-Cover Demon | Drunk | 1 | 1 |
| David Zepeda | Carlos | EEG Tech | 1 | 1 |
| Joey Hiott | Josh Age 10 | Ian | 1 | 1 |
| Rachael Bella | Dead Girl | Sarah Gasner | 1 | 1 |
← Buffy the Vampire Slayer × ER
Cast data from TVmaze, licensed CC BY-SA 4.0.