Filmography
| Year | Title | Role | Notes |
|---|---|---|---|
| 1979 | The Onion Field | LAPD Lieutenant #2 | |
| 1990 | Bad Influence | Howard | |
| Taking Care of Business | Ted Bradford Jr. | ||
| 1991 | The Fisher King | TV executive | |
| 1992 | The Hand that Rocks the Cradle | Dr. Victor Mott | |
| 1993 | Arcade | Difford | |
| 1993 | Fearless | Jeff Gordon | |
| 1995 | Evolver | Russell Bennett | |
| 1996 | Multiplicity | Ted | |
| 1998 | You Lucky Dog | ||
| 2000 | Woman on Top | Alex Reeves | |
| 2001 | Nicolas | Dr. Fisher | |
| Good Advice | Ted | ||
| 2002 | The Big Time | ||
| 2007 | Reign Over Me | Nigel Pennington | |
| Teenius | Principal Senseman | ||
| 2008 | Quality Time | Nathan Eastman | |
| Pathology | Dr. Quentin Morris | ||
| 2009 | Crank: High Voltage | News Anchor | |
| Gamer | Chief of Staff |
| Year | Series | Role | Notes |
|---|---|---|---|
| 1977–1978 | The Six Million Dollar Man | various | Incl. Episode "Death Probe" |
| 1978–1979 | Emergency! | Dr. Deroy | |
| 1979 | Battlestar Galactica | Officer | Episode "Experiment in Terra" |
| 1981 | Nero Wolfe | Tom Irwin | Episode "Might as Well Be Dead" |
| 1982–1986 | Days of our Lives | Eugene Bradford | |
| 1983 | The Thorn Birds | Alastair MacQueen | television mini-series |
| 1986 | The New Twilight Zone | The Dispatcher | segment "Dead Run" |
| MacGyver | Brian Ashford | Episode "The Escape" | |
| Murder, She Wrote | Binky Holborn | Episode: "If the Frame Fits" | |
| 1987–1994 | Star Trek: the Next Generation | Q | Episodes: "Encounter at Farpoint", "Hide and Q", "Q Who", "Deja Q", "Qpid", "True Q", "Tapestry" and "All Good Things..." |
| 1988 | Mission: Impossible revival series | Matthew Drake | Episode "The Killer" |
| 1989 | Get Smart, Again! | Major Preston Waterhouse | uncredited |
| 1989 | The Nutt House | Norman Shrike | Episode: "Pilot" |
| 1991 | L.A. Law | Mark Chelios | Episode "The Beverly Hill Hangers" |
| 1992 | Civil Wars | ||
| 1993 | Star Trek: Deep Space Nine | Q | Episode: "Q-Less" |
| 1993 | Batman: The Animated Series | Eagleton | |
| 1994 | Without Warning | Reporter | TV movie in mockumentary style |
| 1995 | Legend | Janos Bartok | |
| 1996 | Picket Fences | District Attorney | Episode "Three Weddings and a Meltdown" |
| 1997 | Duckman | Tyler Fitzgerald | Episode "From Brad to Worse" |
| Touched by an Angel | Justinian Jones | Episode: "Jones vs. God" | |
| 1996–2001 | Star Trek: Voyager | Q | Episodes: "Death Wish", "The Q and the Grey" and "Q2" |
| 1999 | The Real Adventures of Jonny Quest | Dr. Quest | |
| 2000 | Angry Beavers | The Yak in the Sack | Episode: "Yak in the Sack Gets Thwacked" |
| 2000 | The West Wing | Al Kiefer | |
| Sports Night | Bert Stors | Episode "April is the Cruelest Month" | |
| 2001 | Special Unit 2 | King of the Links | Episode "The Eve" |
| 2001 | The Practice | Walter Bannish | |
| 2001–2002 | Stargate SG-1 | Colonel Frank Simmons / Goa'uld | Seasons 5–6 (5 episodes) |
| 2003 | Judging Amy | Dr. Eagan | Episode "Picture of Perfect" |
| Duck Dodgers | Sinestro | Episode "The Green Loontern" | |
| 2004–2005 | Charmed | Odin | |
| 2005 | The Closer | Dr. Dawson | Episode "Flashpoint" |
| 2009 | Greek | Himself | Episode "The Dork Knight" |
| 2009 | Crank: High Voltage | Fish Halman | |
| 2009–2010 | Breaking Bad | Donald Margolis | |
| 2011 | Law & Order: LA | Judge Avery Staynor | Episode "Carthay Circle" |
| Torchwood: Miracle Day | Agent Allen Shapiro | ||
| Young Justice | Mister Twister | Episode: "Welcome to Happy Harbor" | |
| My Little Pony: Friendship Is Magic | Discord | Episodes: "The Return of Harmony Part 1" and "The Return of Harmony Part 2" | |
| 2012 | NTSF:SD:SUV:: | Leonardo Da Vinci | Episode "Time Angels" |
| 2012 | The Secret Circle | Royce Armstrong | Episode "Crystal" |
Read more about this topic: John De Lancie