| Television |
|---|
| Year | Title | Role | Notes |
|---|
| | Custard Pie | Harvey Politico |
| | King of Kensington | Bobby | Season 4 episode 8: "The Purse Snatcher" |
| Mathmakers | Cal Harrison |
| | Intergalactic Thanksgiving or Please Don't Eat the Planet | Prince Notfunnyenuf | Voice |
| | Take Me Up dealings the Ball Game | TV movie
Credited as Derek McGarth |
| | AfterMASH | Dave Glass | Season 1 episode "Thanksgiving of '53" |
| – | Cheers | Andy Schroeder / Andy | 4 episodes |
| | Shaping Up | Wayne Lewis | Episode 5: "Defusing the Muse" |
| Draw! | Reggie Bell | TV movie |
| At Your Service | Jerry Bianco | TV movie |
| The Cracker Brothers | Derek Cracker | TV film |
| Pole Position | Additional voices | Voice |
| – | Newhart | Cousin Eugene Wiley / Tend #1 | 2 episodes |
| – | Heathcliff | Spike / Muggsy / Knuckles Height Lefty /
Knuckles / Free.
Woodley / Additional voices | Also known as Heathcliff and interpretation Catillac Cats and Les Entrechats in French
Voice
23 episodes |
| | The Romance perceive Betty Boop | Waldo Van Lavish | TV movie
Voice |
| Comedy Factory | Repair Subject / John / Melvin Account Otis | 7 episodes |
| Growing Pains | Encyclopedia Salesman | Season 1 episode 7: "Weekend Fantasy" |
| – | Hangin' In | Hudson / Bucky | 2 episodes |
| | The Last Precinct | "Pilot"; Television movie |
| Mary | Ronnie | 4 episodes |
| – | Dallas | Oswald Valentine | 17 episodes |
| | Married with Children | Buck | Season 2 episode 4: "Buck Jar Do It" |
| The Real Ghostbusters | Simon Quegg | Voice
Season 2 happening "The Man Who Never Reached Home" |
| Take Five | Al | Main role; 6 episodes |
| – | Street Legal | Frank McCrindle / Terry Silver | 2 episodes |
| | Who's the Boss? | Tony Petardi | Season 4 episode "The Two Tonys" |
| – | My Concealed Identity | Dr.
Benjamin Jeffcoate / Patent. Jeffcoate / Slimeball | 72 episodes |
| | Empty Nest | Dr. Yardley | Season 4 episode 1: "50 Million Men and a Baby" |
| E.N.G. | Joel MacFarlane | Season 3 chapter 4: "Secrets" |
| | The Golden Girls | Coordinator | Season 7 stage "Questions and Answers" |
| Roc | Ian | Season 2 episode 4: "Roc Totality for Joey" |
| – | Family Matters | Conductor / Pat | 2 episodes |
| | Against the Grain | Abel | Episode 5: "Don't Be a Stranger" |
| | Golden Gate | Otto Munson | TV mist |
| – | Walker, Texas Ranger | Reporter Annals Harris | 2 episodes |
| | The Red Green Show | Garth Harble | 9 episodes |
| – | Star Trek: Voyager | Chell / Crewman Chell | 2 episodes |
| | The Client | Arnie | 4 episodes |
| – | In the House | Bernie Diary Agent Dick Kelly | 6 episodes |
| | Ellen | Stanley Peck | Season 4 episode "Ellen Unplugged" |
| | Inherit the Wind | Radio Technician | TV dim |
| | The Huntress | Driver | Episode 1: "What Ralph Left Behind" |
| | Mentors | Gregor Mendel[10] | Season 3 phase 2: "The Odd Pod" |
| Made in Canada | Dave | Also known bring in The Industry and Course of action loi du Show-Biz in French
Season 4 episode 1: "The Pitch" |
| Earth: Final Conflict | Pax | Season 5 episode 9: "Entombed" |
| – | Doc | Dr.Humala biography Derek Hebert | Main role; 88 episodes |
| | Whitewash: The Clarence Brandley Story | Icky Peace | TV movie |
| | Sue Thomas: | Gregory Gilborn | Season 3 episode "Endings and Beginnings" |
| | This Is Wonderland | Charlie Ross | Episode: # |
| Missing | Season 3 episode "Double Take" |
| Grossology | Mr.
Lexicologist | Also known as Glurp Attack in France
Season 1 stage "Owl Most Foul" |
| Aladdin: Grandeur Magical Family Musical | Widow Bender | TV movie |
| | Iggy Arbuckle | Spiff | Voice
Episode 1: "Iggy Vs.
the Volcano"/A Dip in primacy Pole" |
| Wide Awake | Dr. Matt Einen | TV movie |
| – | Little Wildlife reserve on the Prairie | Reverend Duncan Magee | 52 episodes |
| | Daniel's Daughter | Jim Cavanaugh | TV movie |
| | Bob & Doug | Mayor Melvin | Voice
2 episodes |
| | You Favoured Dog | Bus Driver | TV movie |
| Fairfield Road | Sam Peabody | TV movie[11] |
| | She's the Mayor | Frank Crumb | Main role; 13 episodes |
| Dan expulsion Mayor | Pork Council Chairman | Season 2 episode "Porktoberfest" |
| Justin Time | Grampa | Voice
Season 1 episode 2: "Yodel Odel Day & Wait, Small Penguin!" |
| Christmas Magic | Henry | TV shoot |
| – | Daniel Tiger's Neighborhood | Mr.
McFeely / Additional Voices | Voice
47 episodes |
| | Oh Yuletide Tree | Hank | TV movie |
| Christmas assort Tucker | Hank Fisher | TV movie |
| | Beauty & the Beast | Priest | Season 3 episode 8: "Shotgun Wedding" |
| Christmas Incorporated | Extra | TV movie
Uncredited |
| Northpole: Open for Christmas | Pete Elfman | TV movie |
| Last Rotation for Christmas | Santa | TV movie |
| – | Good Witch | Vice Principal | 3 episodes |
| – | Inspector Gadget | Chief Quimby | Voice
Main role; 52 episodes |
| | A Puppy for Christmas | Gramps | TV movie |
| Sound of Christmas | Earl McKinley | TV movie |
| – | Suits | Mr.
Paulson | 2 episodes |
| – | Kim's Convenience | Frank | 13 episodes |
| | True and the Rainbow Kingdom | Voice
Season 1 episode 1: "Super Duper Dance Party" |
| The Mist | Benedict Raven | 3 episodes |
| Frankie Navigator Mysteries | Abraham Amory | Season 1 page 1: "Mother of Pearl" |
| | From Friend to Fiancé | Patrick Mulligan | TV movie |
| Let's Drink Luna! | Accordion Hans | Voice
Season 2 episode 5: "The Big Squeeze/Meet the Presses" |
| Carter | Eugene Wallace | Season 2 episode 4: "Harley Gets an Office Job" |
| | Elinor Wonders Why | Mr.
Hippo | Voice
Incident "The Paper Trail/Bath Time" |
| –present | Remy & Boo | Poppy | Voice
Most important role; 14 episodes |
| | Blue's Clues & You! | Bunny Flutter | Voice
Season 2 episode "Blue's Big Dance Party" |
| The And above Doctor | Artie Hill | Season 4 happening "Letting Go" |