All 76 actors in both ER and Grimm
76 actors have appeared in both ER and Grimm, across 454 episodes. The most-credited is Robert Blanche, Detective Milne in ER and Franco in Grimm.
| Actor | In ER | In Grimm | Eps | Eps |
|---|---|---|---|---|
| Robert Blanche | Detective Milne | Franco | 1 | 34 |
| Lisa Vidal | Fire Lieutenant Sandy Lopez | DA Lauren Castro | 12 | 2 |
| Ted Rooney | Dr. Tabash | James Addison, Purifier | 6 | 3 |
| Shohreh Aghdashloo | Riza Kardatay | Stefania Vaduva Popescu | 1 | 7 |
| Sam Anderson | Dr. Jack Kayson | Rolek Porter | 19 | 1 |
| C. Thomas Howell | Vincent Jansen | Weston Steward | 1 | 4 |
| Alla Korot | Mrs. Dupont | Dasha Karpushin | 1 | 3 |
| Henri Lubatti | Victor | Slivitch | 1 | 2 |
| Jonathan Scarfe | Chase Carter | Reverend Lance B. Calvin | 8 | 1 |
| Tim Griffin | Captain John Evans | Mr. Keary | 2 | 1 |
| Bertila Damas | Dr. Debra Wexler | Pilar | 1 | 4 |
| Carlos Gómez | Paramedic Raul Melendez | Anselmo Baledin | 6 | 1 |
| Elizabeth Rodriguez | Nurse Sandra | Agent Katrina Chavez | 3 | 5 |
| Eric Lange | Rod Stillman | Dominick Spinner | 1 | 1 |
| Freda Foh Shen | Audiologist | Lani Tomas | 3 | 1 |
| Frederick Koehler | Benjamin Coe | Marty Burgess | 1 | 1 |
| Mark Pellegrino | Nathan Conley | Jarold Kempfer | 1 | 1 |
| Nancy Linehan Charles | Glenda Walton | Elizabeth Stanton | 1 | 1 |
| Will Rothhaar | Robert "Bo" Borsalino | Officer Jesse Acker | 1 | 3 |
| Alicia Lagano | Tracy | Alicia | 1 | 2 |
| Daniel Roebuck | Kyle Martin | Lt. Orson | 1 | 2 |
| Jessica Tuck | Dr. Hemmings | Catherine Schade | 1 | 3 |
| Shaun Toub | Butler | Conrad Bonaparte | 1 | 4 |
| Booboo Stewart | Power Ranger | Simon George | 1 | 1 |
| Emily Rios | Tracy Martinez | Frankie Gonzales | 1 | 1 |
| Jamie McShane | Josh Rushing | Johnny Kreski | 1 | 1 |
| John Pyper-Ferguson | Tom Coggins | Hayden Walker | 1 | 1 |
| Josh Stewart | Daniel | Bill Granger | 1 | 1 |
| Keiko Agena | Mrs. Shimahara, Mrs. Vasquez | Madoka Akagi | 2 | 1 |
| Reg E. Cathey | David Haskell | The Baron | 1 | 3 |
| Tom Wright | Wharton | Spencer Harrison | 2 | 1 |
| Alain Uy | Burke | Sam Tomas | 1 | 1 |
| Brad William Henke | John | Hap Lasser | 1 | 1 |
| Danny Mora | Guillermo | Benito | 3 | 1 |
| Jonathan Slavin | Ron | Paul Wemlinger | 1 | 1 |
| Patrick Fischler | Chamber Tech | Billy Capra | 1 | 1 |
| Romy Rosemont | Joanne Bairos | Beatrice Bennett | 1 | 1 |
| Brad Greenquist | Mr. Butler | Steiger | 2 | 1 |
| Derek Mears | Mugger | Krampus | 2 | 1 |
| Karen Tucker | Lori | Landlady, Receptonist | 1 | 2 |
| Robert Clendenin | Anesthesiologist | Xavier Arivaca | 1 | 2 |
| Anne Dudek | Paula Gamble | Professor Vera Gates | 1 | 1 |
| Anthony De Longis | ENT | Judge Logan Patterson | 1 | 1 |
| Brian McNamara | Gil Brenner | Abel Mahario | 1 | 1 |
| Brigid Brannagh | Jamie Hendricks | Sara Fisher | 1 | 1 |
| Currie Graham | James | Frank Rabe | 1 | 1 |
| David Barrera | Felix Hernandez | Luis Alvarez | 1 | 1 |
| Gabriel Salvador | Eddie | Dallas Cruz | 1 | 2 |
| Jeanine Jackson | Elise Stevens | Paula | 1 | 1 |
| Judith Hoag | Mrs. Brenner | Mrs. Jessup | 1 | 1 |
| Manny Montana | Football Orderly | David Florez | 1 | 1 |
| Matthew Yang King | Rick | Jin Akagi | 1 | 1 |
| Megan Henning | Katie Milner | Molly Fisk | 1 | 1 |
| Michael Maize | James | Adrian Zayne | 1 | 1 |
| Sam Witwer | Tommy | Max Robbins | 1 | 1 |
| Tim Bagley | Archie Papion | Postman | 1 | 1 |
| Wade Williams | Migraine Guy | Mark Halloway | 1 | 1 |
| David Figlioli | Nolan | Logan Cobb | 1 | 1 |
| LisaGay Hamilton | Nadine Hopkins | Mrs. Pittman | 1 | 1 |
| Rick Overton | Mr. McNamara | Felix | 1 | 1 |
| Ryan Sands | Jeremy | Special Agent Lofthouse | 1 | 1 |
| Dean Chekvala | Mugger | Wayne Dunbar | 1 | 1 |
| Gina Gallego | Instructor | Miss Garcia | 1 | 1 |
| Mary Ann Jarou | Dora | Serena Dunbrook | 1 | 1 |
| Danny Belrose | Joey | Sammy | 1 | 1 |
| Jana Lee Hamblin | Cheryl Leary | Amanda Proctor | 1 | 1 |
| Max Arciniega | Nick Vasquez | Diego Hoyos | 1 | 1 |
| Arlen Escarpeta | Adrian | Clay Pittman | 1 | 1 |
| Gary Kraus | CJ | Beau Childs | 1 | 1 |
| James Martin Kelly | Mednick | Abe Tucker | 1 | 1 |
| Casey McFeron | Wes | Ray Collins | 1 | 1 |
| Duffy Epstein | Griffis | Businessman | 1 | 1 |
| George Ketsios | Bachelor #4 | Det. Boyd Baribeau | 1 | 1 |
| Shontina Vernon | Mrs. Trager | Saleswoman | 1 | 1 |
| Heath Lourwood | Student #7 | Uni / Doorman | 1 | 1 |
| Tony Donno | Drummond | Man 1 | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.