All 192 actors in both The Practice and The X-Files
192 actors have appeared in both The Practice and The X-Files, across 385 episodes. The most-credited is James Pickens, Jr., Detective Mike McKrew in The Practice and Deputy Director Alvin Kersh in The X-Files.
| Actor | In The Practice | In The X-Files | Eps | Eps |
|---|---|---|---|---|
| James Pickens, Jr. | Detective Mike McKrew | Deputy Director Alvin Kersh | 15 | 22 |
| Richard McGonagle | Judge Patrick Wilcox | Dr. Francis Orovetz | 16 | 1 |
| Charles Cioffi | Judge Walter Kimball | Section Chief Scott Blevins | 5 | 5 |
| Susan Blommaert | Judge Rudy Fox | Phyllis H. Paddock | 7 | 1 |
| Michael Emerson | William Hinks | Oliver Martin | 6 | 1 |
| Mik Scriba | Detective Frank Simons | Lieutenant Kraskow | 6 | 1 |
| Arye Gross | Rabbi Daniel Warner, Attorney John Franklin | Dr. Puvogel | 5 | 1 |
| Donal Logue | A.D.A. Dickie Flood | Agent Tom Colton | 5 | 1 |
| Gibby Brand | Judge William McGough | Arthur Gaffin | 5 | 1 |
| Edward Asner | Judge Marcus Winnaker, Judge Matlin Pratt | Maurice | 4 | 1 |
| John Hawkes | Stuart Donovan | Phillip Padgett | 3 | 1 |
| Lindsey Ginter | John Schramm | Crew-Cut Man | 2 | 2 |
| Stanley Anderson | Dr. Robert Gale, Dr. Thomas Bellamy | Agent Lewis Schoniger | 3 | 1 |
| Steven Flynn | D.A. Martin Toomey | CIA Agent | 3 | 1 |
| Willie Garson | D.A. Frank Shea | Henry Weems, Quinton 'Roach' Freely | 2 | 2 |
| Željko Ivanek | A.U.S.A. Steven Sanders, Assistant District Attorney General James McGovern, Matthew Davies | Roland Fuller | 3 | 1 |
| John Finn | Detective Henry Doaks | Michael Kritschgau | 2 | 5 |
| James Handy | Lieutenant Paul Stewart, Philly Sidlow | Detective Alan Cross | 2 | 1 |
| Michael Fairman | Governor's Council Richmond, School Board President Harold Shaw | Jason Nichols | 2 | 1 |
| Paul McCrane | Martin Parks | Leonard Betts | 2 | 1 |
| Ryan Cutrona | Dr. Patrick Fine, FBI Coroner George Wall | Captain | 5 | 1 |
| Melinda McGraw | Marcie Bartos | Melissa Scully | 1 | 4 |
| Tony Amendola | Dr. Bernard Gorman, Dr. Alvin Traub, Dr. Emmanuel Willis | Cigarette Smoking Pontiff | 4 | 1 |
| Alan Dale | Judge Robert Brenford | Toothpick Man | 2 | 4 |
| Andrew J. Robinson | Edmond Solomon | Dr. Ian Detweiler | 1 | 1 |
| Austin Tichenor | A.D.A. Kenneth Tisbury | Dr. James Langenhahn | 5 | 1 |
| Caroline Kava | Mary Donovan | Doris Kearns | 3 | 1 |
| Dirk Blocker | Jason Grove | Mayor Jim Gilmore | 1 | 1 |
| Doug Hutchison | Jackie Cahill | Eugene Victor Tooms | 2 | 2 |
| Eve Brenner | Sybil Walters | Little Old Lady | 1 | 1 |
| Heather McComb | Lynette Hayes | Shannon Ausbury | 1 | 1 |
| Jack McGee | Detective Schitt | Bob Damphouse | 1 | 1 |
| Jayne Atkinson | Ruth Gibson | Willa Ambrose | 1 | 1 |
| Joe Morton | U.S. Attorney | Martin Wells | 1 | 1 |
| Mark Pellegrino | Herrick Smoltz | Derwood Spinks | 1 | 1 |
| Mark Sheppard | Eddie Wicks | Bob the Caretaker / Cecil L'Ively | 1 | 1 |
| Nicolas Surovy | Richard Baldwin, Dr. Henry Richards | Dr. Daniel Waterston | 3 | 1 |
| Titus Welliver | Gordon | Doug Spinney | 1 | 1 |
| Tracy Middendorf | Jennifer Cole | Gracie | 3 | 1 |
| William Sanderson | Mr. Simmons | Ed Funsch | 1 | 1 |
| David Moreland | A.D.A. Matthew Platt, Coroner | Roy Cohn | 4 | 1 |
| John Aylward | Federal Judge Kendall Marcott, Chief District Court Judge W. Frankle, Judge in Rydell Hearing | Dr. John Rietz | 4 | 1 |
| Pat Skipper | Officer Scott Guthrie | Bill Scully Jr. | 1 | 4 |
| CCH Pounder | Helene Washington | Agent Lucy Kazdin | 2 | 1 |
| Paul Ben-Victor | Benny Small | Dr. Aaron Monte | 2 | 1 |
| Robert Curtis Brown | Attorney John Wicker, Scott Simpson | Assistant DA Damon Kaylor | 2 | 1 |
| Silas Weir Mitchell | Anthony Brickman | Dougie | 2 | 1 |
| Steve Railsback | Walter Dawson | Duane Barry | 1 | 2 |
| Anthony Heald | Judge Wallace Cooper, Scott Guber | Harold Piller | 3 | 1 |
| Kenneth Welsh | Judge Andrew Harrod | Simon Gates / Millenium Man | 3 | 1 |
| Leon Russom | Brian Kearns | Detective Miles | 2 | 2 |
| Thomas Kopache | Dr. Harold Manning, Judge Morris Seymour, Mr. Schramm | General Thomas Callahan | 3 | 1 |
| Colleen Flynn | Wendy Stuart | Colleen Azar, Michele Fazekas | 3 | 2 |
| Steven Anderson | Dr. Emerick, Dr. Barry Jacob | Dr. James Parenti | 3 | 2 |
| Barry Primus | Mr. Goodwin | Robert Dorland | 1 | 1 |
| Bradford English | Roland Monroe | Detective Abbott | 1 | 1 |
| Bruce Weitz | D.A. Robert Webb | Agent Moe Bocks | 1 | 1 |
| Chris Ellis | Donald Blane | Sheriff Lance Hindt | 1 | 1 |
| Christine Estabrook | Judge Maureen Zisk | Agent Henderson | 1 | 1 |
| Christopher Allport | Yates | Agent Jack Willis | 1 | 1 |
| Cliff DeYoung | Attorney Randall West | Mr. Jay Nemman | 3 | 1 |
| David Purdham | Attorney Matthew Stone | Dr. Lev | 3 | 2 |
| Dennis Boutsikaris | U.S. Attorney Greg Mitchell | Dr. Peter Voss | 1 | 1 |
| George Gerdes | Gun Manufacturer | Reverend Calvin Hartley | 1 | 1 |
| Harriet Sansom Harris | Ellen Blake | Dr. Sally Kendrick, Eve 6 | 1 | 1 |
| James Hong | Min Wong | Hard-Faced Man | 1 | 1 |
| James Sutorius | D.A. Mark Henderson | Babcock | 3 | 1 |
| Jeremy Roberts | Alan Neel | George Vincent | 3 | 1 |
| Marjorie Lovett | Jury Foreperson, Margaret Healy | Elaine Tanner | 2 | 1 |
| Michael Cavanaugh | Primate Center Director Kenneth Patterson | Sheriff Jack Withers | 1 | 1 |
| Michael O'Neill | Judge Robert Temple | Patrol Captain | 1 | 1 |
| Michael Rothhaar | Judge Laurence Abrahams, Leonard Welish | Dr. Couvillion | 2 | 1 |
| Penny Johnson Jerald | Attorney Laura Garrett | Dr. Hellura Lyle | 1 | 1 |
| Ray McKinnon | Frank Vaughan | Mad Wayne | 1 | 1 |
| Raymond Cruz | Miguel Moreno | Eladio Buente | 1 | 1 |
| Steve Ryan | Detective Alan Slezak | Sheriff Jack Coogan | 1 | 1 |
| Timothy Carhart | Officer Paul Brewer | Virgil Incanto | 1 | 1 |
| Tom Bower | John Pierce | Sheriff Harden | 2 | 1 |
| Tucker Smallwood | Dr. Henry Matthews, Dr. Mick Benson | Sheriff Andy Taylor | 2 | 1 |
| Zach Grenier | Detective R. Larson | Herman Stites | 2 | 1 |
| Jim Jansen | Attorney Richard Hart, Attorney Ryan Hall, Stephen Gould | Dr. Heitz Werber | 3 | 3 |
| McNally Sagal | U.S. Attorney Melnick | Overcoat Woman | 2 | 2 |
| Steve Rankin | Stephen Jamison | U.S. Marshal Daddo | 3 | 1 |
| Brien Blakely | TV Reporter Kevin Herndon, Newsanchor Scott Schmidt, Reporter #1 | Reporter | 5 | 1 |
| Chad E. Donella | Kevin Peete | Rob Roberts | 2 | 1 |
| Randy Oglesby | Dr. Feldman, Judge Kelly White | Reverend Samuel Mackey | 2 | 1 |
| Wendy Gazelle | Deborah Munce, Laura Redstone | Kathy Dukes | 2 | 1 |
| Anne DeSalvo | Sylvie Adelstein | Dr. Anne Carpenter | 1 | 1 |
| Colby French | Richie Price | Deputy | 1 | 1 |
| Frank Novak | Dick Walsh | Raybert Fellowes | 1 | 1 |
| Jack Blessing | D.A. Horowitz | Dr. Jack Preijers | 1 | 1 |
| James McDonnell | Jury Foreman | Detective Van Allen | 1 | 1 |
| Kellie Waymire | Dr. Marshall | Tammi Peyton | 1 | 1 |
| Lisa Jane Persky | Karen Garvey | Laura Weinsider | 1 | 1 |
| Michael Chieffo | Chris Varley | Carl Wade | 1 | 1 |
| Michael Massee | Norman Tucker | Vernon Ephesian | 1 | 1 |
| Micole Mercurio | Gracie Kramer | Miss Stodie | 1 | 1 |
| R.D. Call | Detective Allan Morrison | Sheriff Maurice Daniels | 1 | 1 |
| Stephen Hornyak | Jason McNeil | Dr. Paul Kopeikan | 1 | 1 |
| Dey Young | Elena Wharton | Judy Bishop | 2 | 1 |
| Lawrence Pressman | Dr. Milton Leach, Russell Mathis | Mr. Milsap | 2 | 1 |
| Madison Mason | Attorney Jacob Hurwitz, FDA Doctor Herwitz | Captain Yip Harburg | 2 | 1 |
| Spencer Garrett | A.D.A. Carter | Harry Bring | 2 | 1 |
| Tom Mason | Raymond Littlefield | Detective Waltos | 2 | 1 |
| Andi Chapman | Vonda White | Dr. Monique Sackheim | 1 | 1 |
| Conor O'Farrell | D.A. Albert Bellamy | Sheriff Ciolino | 1 | 1 |
| Daniel Von Bargen | Detective Smiley | Jacob Steven Haley | 1 | 1 |
| David Doty | Foreman, Judge Robert Bournes | Minister | 2 | 1 |
| David Figlioli | Mark Harris | Victor Dale Potts | 1 | 1 |
| Dean Norris | Detective | U.S. Marshal Tapia | 1 | 1 |
| Dion Anderson | Ronald Morgan | Sheriff Frass | 1 | 1 |
| George D. Wallace | Judge Andrew Wood | Bertram Mueller | 2 | 1 |
| Henri Lubatti | Wendall Forsley | Dr. Wilkenson | 1 | 1 |
| Holmes Osborne | Jeffrey Hyde | Mark Johnson | 1 | 1 |
| J. Patrick McCormack | Pierce Stanton | Brent Tufeld | 1 | 1 |
| John Kapelos | Officer John Rydell | Agent Fordyce | 1 | 1 |
| John Prosky | EPA Attorney Mitchell Kravits | Medical Examiner | 3 | 1 |
| Mimi Lieber | D.A. Marcia Scott | Anita Fiore | 1 | 1 |
| Paul Hayes | Walter Cates | Mr. Gilmore | 1 | 1 |
| Phil Abrams | Gary Strangis, Randy Peete | Little Fritz | 2 | 1 |
| Richard Cox | Attorney Stuart Miller | Daniel Brimley | 1 | 1 |
| Scott MacDonald | Detective Disaia | Curtis Delario | 1 | 1 |
| Tom Jourden | Attorney Tom Cooperman | Carlton Chase | 1 | 1 |
| Vyto Ruginis | Jason Swoboda | Lieutenant Bianco | 1 | 1 |
| Christopher Michael | FBI Agent Gus Lewis, Police Officer | Trusty | 2 | 1 |
| Scott Allan Campbell | D.A. | Jeff Smoodge | 1 | 2 |
| Alan Davidson | Alex Dickson | Bearded Man | 1 | 1 |
| Alex Carter | John Doe | Chief Strong | 1 | 1 |
| David Bowe | Harris Reed | Robert Werther | 1 | 1 |
| Denise Dowse | Caroline | Dr. Babsi Russel | 1 | 1 |
| Jordan Lee Williams | Guy | Basketball Player | 1 | 1 |
| Kevin C. Loomis | Josh Pinker | Chef | 1 | 1 |
| Ming Lo | Doctor No. 1 | Dr. Kim | 1 | 1 |
| Paul Lieber | District Attorney | Micah Hoffman | 1 | 1 |
| Shareen Mitchell | Julia Stone | Billie LaPierre | 1 | 1 |
| Suanne Spoke | Sophie Taylor | Woman Customer | 1 | 1 |
| Vic Polizos | Detective Wes Pegler | Agent Frank Burst | 1 | 1 |
| Jacqueline Schultz | Margot Berrett, Shirley Yelon | Irene McPeck | 2 | 1 |
| Andy Umberger | A.D.A. Virgil Johnson | Agent Chesty Short | 1 | 1 |
| Chet Grissom | Jeremy Forbes | Detective | 1 | 1 |
| Dan Desmond | Judge Max Clammage | Harry Odell | 1 | 1 |
| Gregory Cruz | Assistant D.A. George Whanapuckam | Diego Garza | 1 | 1 |
| Paul Vincent O'Connor | Attorney Milton Cados | Warden Brian Hutchinson | 1 | 1 |
| Robert Peters | Officer Cooper | Sergeant | 1 | 1 |
| Frank Ertl | Juror | Elder #5 | 1 | 2 |
| James Geralden | Detective Bernard Nelsonm, Detective John Carringhan | Detective Lacoeur | 2 | 1 |
| Bernard White | Ahmad Sharif | Dr. Desai | 1 | 1 |
| David Wells | Jonathan Cramer | Mr. Babbitt | 1 | 1 |
| Ken Meseroll | Attorney Jonathan Lambert | Owen Harris | 1 | 1 |
| Kiersten Van Horne | Officer Cynthia Henderson | Young Social Worker | 1 | 1 |
| Lamont Johnson | Voice | Whaley | 1 | 1 |
| Mark Chaet | Notary Public | Bank Officer | 1 | 1 |
| Michael Dempsey | Officer Stroud | Sheriff | 1 | 1 |
| Monnae Michaell | Patricia Fletcher | Female Coroner | 1 | 1 |
| Murray Rubinstein | Carl Leiberman | Dr. Sandoz | 1 | 1 |
| Pat Destro | Cindy Graham | Joan Scobie | 1 | 1 |
| Patience Cleveland | Sylvie Tyler | Arbutus Ray | 1 | 1 |
| Scott Alan Smith | Doctor | Prison Doctor | 1 | 1 |
| Cheryl White | Christine Shepard | Nurse #3 | 1 | 1 |
| Dan Gifford | Mark Underwood | News Anchor | 1 | 1 |
| Jack Shearer | Mr. Johnson | Judge Kinberg | 1 | 1 |
| John Billingsley | Revenue Officer Robert Schmitt | Timothy "Timmy the Geek" Landau | 1 | 1 |
| Mark Craig | Officer | Trooper Velasco | 1 | 1 |
| Mary Kathleen Gordon | Bridal Shop Seamstress | Woman | 1 | 1 |
| Arthur Taxier | Attorney Andrew Stanton | Assistant Director Bart | 1 | 1 |
| Barry Wiggins | Police Officer | NYPD Detective | 1 | 1 |
| Brian Reddy | Dr. Pankin | Big Fritz | 1 | 1 |
| Christopher Stanley | Officer Kent | Agent Farah | 1 | 1 |
| Derick Alexander | Orderly | Bailiff | 1 | 1 |
| Dwight Hicks | Checkpoint Officer No. 1 | Prison Armed Guard | 1 | 1 |
| Elayn J. Taylor | Judge Haley Logan | Nurse #2 | 1 | 1 |
| Irene Muzzy | Foreperson | Waitress | 1 | 1 |
| Jack Forbes | Foreman | Ray's Double | 1 | 1 |
| Lou Richards | ADA Tom Connolly | Officer Custer | 1 | 1 |
| Robert Joseph | Officer Jones | Big Security Guard | 1 | 1 |
| Bruce Wright | Grant Holmstead | Gary Garber | 1 | 1 |
| Clement E. Blake | Homeless Man | Holy Spirit Man #2 | 1 | 1 |
| Joe Shea | Stanley Brenner | Dana Scully | 1 | 1 |
| Kevin McClatchy | Officer McPhee | James Leeds | 1 | 1 |
| Lennie Loftin | Guard with Randy's Last Meal | Coranado | 1 | 1 |
| Martin Ferrero | Sam Feldberg | Assassin | 1 | 1 |
| Robert Lipton | FBI Special Agent Charles Renford | Head Surgeon | 1 | 1 |
| Elyse Donalson | Clerk | Elderly Woman | 1 | 1 |
| James Newman | Coroner Mitchell Falk | Lead Surgeon | 1 | 1 |
| Karl T. Wright | Andrew Burton | Associate #1 | 1 | 1 |
| Mimi Savage | Stephanie Jones | Teacher | 1 | 1 |
| Damon Saleem | Officer Coolidge | Pick-Up Player | 1 | 1 |
| Jason Felipe | Paramedic | Bald Geek | 1 | 1 |
| Jerry Giles | Security Guard | Security Guard | 1 | 1 |
| John O'Brien | Foreman | Missionary #2 | 1 | 1 |
| Michael Sidney | Court Security Officer | Security Guard | 1 | 1 |
| Brian Catalano | Plainclothes | Passenger Agent | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.