His appearance in science fiction films and television productions has been prolific. McNulty grew up in Rossland, British Columbia. He studied music and acting at Washington State University and graduated from Studio 58, Langara College in Vancouver, British Columbia. He put his acting skills to work first on stage, working for two years from 1984 to 1985 at the Stratford Festival. In 1986, McNulty made his break in screen work. Since that time, he continued on an extensive track of television and film work. In 2015 Kevin decided to volunteer his time to a UK-based charity where he worked in the corporate team providing advice to the rest of the charity. He also worked alongside John Hartson who had volunteered at the same charity.
| Year | Title | Role | Notes |
|---|
| 1986 | Firefighter | Firefighter Stranan | TV film |
| 1986 | {{sortname>The|Beachcombers}} | McNab | Episode: "Alekos" |
| 1987 | Stingray | Peters | Episode: "The Second Finest Man Who Ever Lived" |
| 1987, 1989 | Wiseguy | O'Brien, Phil | Episodes: "New Blood", "Heir to the Throne" |
| 1987–1991 | 21 Jump Street | Various | Guest roles |
| 1988 | Earth Star Voyager | Cmdr. Gardiner | Disney TV film |
| 1988 | Laura Lansing Slept Here | Howard | TV film |
| 1990 | Danger Bay | Alan Marcus | Episode: "Listening In" |
| 1990 | Booker | Dr. James Brunswick | Episode: "Crazy" |
| 1990 | Bordertown | Mr. Parker | Episode: "The Pony Riders" |
| 1990 | Neon Rider | Joe, Bill Brenton | Episodes: "Over the Line", "Vengeance" |
| 1991 | Deadly Intentions... Again? | Dr. Uttley | TV film |
| 1991 | Palace Guard | Doggitt | Episode: "The Three-Minute Egg" |
| 1991 | Blackmail | Herb Grayson | TV film |
| 1992 | Diagnosis Murder: Diagnosis of a Murder | Foster | TV film |
| 1992 | Bill & Ted's Excellent Adventures | Falsey | Episode: "It's a Totally Wonderful Life" |
| 1992, 1995 | {{sortname>The|Commish}} | Wayne Tibbets, Capt. Greg Burdage | Episodes: "Video Vigilante", "Brooklyn" |
| 1992, 1995 | The Series | Harry Dawes, David Markum | Episodes: "Revenge Is Sweet", "Reluctant Heroes" |
| 1992–93 | Street Justice | Mr. Frank, Special Agent Simpson | Episodes: "Catcher", "Desperate" |
| 1993 | Liar, Liar: Between Father and Daughter | Reimer | TV film |
| 1993 | When a Stranger Calls Back | Dr. Schifrin | TV film |
| 1993 | For the Love of My Child: The Anissa Ayala Story | Dr. G. Thomas | TV film |
| 1993 | Final Appeal | Blankenship | TV film |
| 1993 | {{sortname>A|Child Too Many|Moment of Truth (film series)}} | Daniel Hall | TV film |
| 1993 | Other Women's Children | Frank Blake | TV film |
| 1993, 1995–96 | {{sortname>The|X-Files}} | Agent Brian Fuller, Dr. Christopher Davey | Episodes: "Squeeze", "Soft Light", "Apocrypha" |
| 1994 | The Jim and Jennifer Stolpa Story | Joe Tirado | TV film |
| 1994 | Cobra | Sheriff Deak Macon | Episode: "Caged Fury" |
| 1994 | {{sortname>The|Man Who Wouldn't Die|The Man Who Wouldn't Die (1995 film)}} | Curruthers | TV film |
| 1994 | Tears and Laughter: The Joan and Melissa Rivers Story | Gene | TV film |
| 1994 | M.A.N.T.I.S. | Fred Saxon | Episode: "First Steps" |
| 1994 | For the Love of Nancy | George Sabbath | TV film |
| 1994 | Cult Rescue | Travis | TV film |
| 1994 | Frostfire | Leonard Marquis | TV film |
| 1995 | Fighting for My Daughter | Sgt. Burnett | TV film |
| 1995 | Freefall: Flight 174 | Larry Roberts | TV film |
| 1995 | {{sortname>The|Marshal}} | Robert Steiner | Episode: "Hitwoman" |
| 1995 | Children of the Dust | Sheriff Harriman | TV miniseries |
| 1995 | {{sortname>The|Other Mother|Moment of Truth (film series)}} | Edward | TV film |
| 1995 | Broken Trust | Judge Peatling | TV film |
| 1995 | When the Vows Break | Joe Rand | TV film |
| 1995 | Ebbie | Mr. Dobson | TV film |
| 1995, 2000 | {{sortname>The|Outer Limits|The Outer Limits (1995 TV series)}} | Dr. Leiberman, Everett Costello | Episodes: "The Message", "Judgment Day" |
| 1996 | Strange Luck | Ira Goldberg | Episode: "In Sickness and in Wealth" |
| 1996 | When Friendship Kills | Ted | TV film |
| 1996 | Generation X | Ralston | TV film |
| 1996 | Abduction of Innocence | D.A. Davis | TV film |
| 1996 | Two | Joe | Episode: "Armies of the Night" |
| 1996 | Titanic | Charles Lightoller | TV miniseries |
| 1996 | {{sortname>An|Unexpected Family|nolink=1}} | Goldani | TV film |
| 1996, 1999 | Viper | Metcalf, Jack Falvo | Episodes: "Die Laughing", "Hell Hath No Fury" |
| 1997 | {{sortname>A|Child's Wish}} | Robbie | TV film |
| 1997 | Alibi | Atty. Hendricks | TV film |
| 1997 | {{sortname>The|Adventures of Shirley Holmes}} | Reg Stebbings | Episode: "The Case of the Mystery Child" |
| 1997 | {{sortname>A|Call to Remember|nolink=1}} | Michael Bratton | TV film |
| 1997 | Final Descent | Henry Gibbons | TV film |
| 1997 | Dead Man's Gun | Alastair Hodge | Episode: "Fortune Teller" |
| 1997 | Convictions | Marshall Link | TV film |
| 1997 | Tricks | Henry | TV film |
| 1997–1999 | Stargate SG-1 | Dr. Warner | Episodes: "The Enemy Within", "Singularity", "Spirits", "Legacy" |
| 1998 | Shattered Hearts | Hal Baylor | TV film |
| 1998 | Silencing Mary | Tom Stuartson | TV film |
| 1998 | {{sortname>An|Unexpected Life|nolink=1}} | Goldani | TV film |
| 1998 | The Legacy | Paul Miller | Episode: "The Covenant" |
| 1998 | {{sortname>The|Net|The Net (U.S. TV series)}} | Judge Thomas Mayall | Episode: "Death of an Angel" |
| 1998 | In the Doghouse | Lee Goldberg | TV film |
| 1998 | {{sortname>The|Color of Courage|nolink=1}} | Thompson | TV film |
| 1998 | Max Q | Oz Gilbert | TV film |
| 1998 | Noah | Donecker | Disney TV film |
| 1999 | First Wave | Ryan | Episode: "Deluge" |
| 1999 | Strange World | Menzes | Episode: "Lullaby" |
| 1999 | Millennium | Dr. Arnett | Episodes: "Darwin's Eye", "Via Dolorosa", "Goodbye to All That" |
| 1999 | Nothing Too Good for a Cowboy | Danny Doyle | Episode: "Float Like a Butterfly" |
| 1999 | Evolution's Child | Dr. Collard | TV film |
| 2000 | Trial by Fire | Warren Vaughn | TV film |
| 2000 | Navigating the Heart | Jack Stanton | TV film |
| 2000 | Secret Agent Man | Clive | Episode: "From Prima with Love" |
| 2000 | The Kincaid Family Story | Dave | TV film |
| 2000 | Quarantine | John | TV film |
| 2000 | Seven Days | Clemons | Episode: "The Dunwych Madness" |
| 2000 | Special Delivery | Fred Anders | TV film |
| 2001 | Anatomy of a Hate Crime | Carl Manzani | TV film |
| 2001 | {{sortname>A|Girl Thing}} | Peter | TV film |
| 2001 | Love and Treason | Director Horvath | TV film |
| 2001 | {{sortname>The|Lone Gunman|nolink=1}} | Wash | Episode: "Maximum Byers" |
| 2001 | Dark Angel | Gil | Episode: "I and I Am a Camera" |
| 2001 | Strange Frequency | Ross Van Horn | Episode: "Don't Stop Believing" |
| 2001–02 | {{sortname>The|Chris Isaak Show}} | Mr. Drubner | Episodes: "It's the Music, Stupid", "Our Place", "Just Us Kids" |
| 2002 | Andromeda | Cuatemoc | Episode: "Bunker Hill" |
| 2002 | Smallville | Mr. Summers | Episode: "Leech" |
| 2002 | The Movie | Max Bettencart | TV film |
| 2003 | Just Cause | Hatcher | Episode: "Reasonable Doubts" |
| 2003 | Out of Order | Priest | TV miniseries |
| 2003 | {{sortname>A|Date with Darkness: The Trial and Capture of Andrew Luster}} | Judge Riley | TV film |
| 2003 | Peacemakers | Charles Curry | Episode: "Dead to Rights" |
| 2004 | Family Sins | Kenneth Geck | TV film |
| 2004 | {{sortname>The|Dead Zone|The Dead Zone (TV series)}} | Dr. Scanlon | Episode: "Total Awareness" |
| 2004 | Cold Squad | David Andrews | Episode: "Girlfriend in a Closet" |
| 2005 | Reefer Madness | Mayor Harris MacDonald | TV film |
| 2005 | Supervolcano | Joe Foster | TV film |
| 2005 | Saving Milly | Sheldon Adler | TV film |
| 2005 | 14 Hours | Larry Dastych | TV film |
| 2005 | Into the West | Thomas Fitzpatrick | Episode: "Dreams and Schemes" |
| 2005–06 | Da Vinci's City Hall | James Dubreau | Guest role (season 1) |
| 2005–2008 | Robson Arms | Stanley Wasserman | Main role |
| 2006 | Stargate Atlantis | Chancellor Lycus | Episode: "Inferno" |
| 2006 | Augusta, Gone | Mr. Wallace | TV film |
| 2006 | {{sortname>The|Collector|The Collector (TV series)}} | Father Derek Martin | Episode: "The Exorcist" |
| 2006 | {{sortname>The|4400}} | Christopher Dubov | Episode: "Gone: Part 2" |
| 2006 | Past Sins | Dale Beckman | TV film |
| 2006 | Firestorm: Last Stand at Yellowstone | Malcolm Levine | TV film |
| 2006, 2014 | Supernatural | Rev. Roy Le Grange, Phillip | Episodes: "Faith", "Ask Jeeves" |
| 2007 | Anna's Storm | Tad Wingate | TV film |
| 2007 | Intelligence | Judd Walters | Episode: "Something in the Air" |
| 2007 | Tin Man | Hank | TV miniseries |
| 2008 | Love to Kill | Daniel Nash | TV film |
| 2009 | Kyle XY | Dr. Fieldman | Episode: "Life Support" |
| 2009 | Spectacular! | Uncle Sam | TV film |
| 2009 | Battlestar Galactica | Frank Porthos | Episodes: "Daybreak: Parts 1-3" |
| 2009 | Impact | Danny | Episode: "1.1" |
| 2009 | Do You Know Me? | Joe Prescott | TV film |
| 2009 | Psych | Chad Wiswall | Episode: "He Dead" |
| 2009 | {{sortname>The|Good Wife}} | Cormac | Episode: "Pilot" |
| 2009 | Sight Unseen | Det. Mike Corland | TV film |
| 2010 | Meteor Storm | Gen. Brock | TV film |
| 2010 | Life Unexpected | Richard | Episode: "Love Unexpected" |
| 2011 | Three Weeks, Three Kids | Russell Mills | TV film |
| 2011 | Endgame | A.C. Chase | Episode: "Huxley, We Have a Problem" |
| 2012–2014 | Arctic Air | Mel Ivarson | Main role |
| 2014 | Mom's Day Away | Don Holland | TV film |
| 2015 | Fatal Memories | Orly Chambers | TV film |
| 2015 | iZombie | The Magnificent Magnus | Episode: "Abra Cadaver" |
| 2015 | Wish Upon a Christmas | Mr. Tomte | TV film |
| 2015–16 | {{sortname>The|Man in the High Castle|The Man in the High Castle (TV series)}} | Dr. Gerald Adler | Episodes: "End of the World", "Travelers" |
| 2016 | Tulips in Spring | Frank | TV film |
| 2016 | Unclaimed | Deputy Chief Quinn | TV film |
| 2016 | Travelers | Earl | Episode: "Hello 685" |
| 2016 | {{sortname>A|Christmas to Remember|A Christmas to Remember (2016 film)}} | Dan Daniels | TV film |
| 2016 | {{sortname>The|Magicians|The Magicians (U.S. TV series)}} | Knight of Crowns | Episode: "Knight of Crowns" |
| 2017 | Daughter for Sale | Judge Smith | TV film |
| 2017 | Murdoch Mysteries | Robert Duncan | Episode: "Home for the Holidays" |
| 2019 | Unspeakable | Arthur | TV miniseries |
| 2019 | Bottled with Love | Earl Everson | TV film |