1987 - 1996 - Star Trek: The Next Generation
1994 - 1994 - Gargoyles TV Series (voice) (Puck)
1995 - 1995 - Deadly Games TV Series (Danny Schlecht)
Specials and Mini Series:
1978 - Dain Curse, The" (Mini Series) (Tom Fink)
1985 - Robert Kennedy & His Times (Mini Series) (Allard Lowenstein)
1989 - Shocker (uncredited) (Talkshow guest)
1999 - Ultimate Trek: Star Trek's Greatest Moments (TV) (archive footage)
1999 - Star Trek: The Next Generation Companion (VG) (archive footage) (Lt. Commander Data)
1999 - Star Trek: Hidden Evil (VG) (Commander Data)
2001 - A Girl Thing (Mini Series) (Bob)
2001 - Star Trek: Bridge Commander (VG) (Starfleet Lt. Commander Data)
Tv Movies:
1970 - My Sweet Charlie (TV) (uncredited)
1985 - Crime of Innocence (TV) (Hinnerman)
1986 - Manhunt for Claude Dallas (TV) (Jim Stevens)
1986 - Sunday in the Park with George (TV) (Franz & Dennis)
1987 - Family Sins (TV) (Ken McMahon)
1989 - What's Alan Watching? (TV) (Brentwood Carter)
1991 - Crazy from the Heart (TV) (uncredited)
1995 - Kingfish: A Story of Huey P. Long (TV) (uncredited)
1995 - Journey's End - The Saga of Star Trek: The Next Generation (V) (Himself)
1999 - Introducing Dorothy Dandridge (TV) (Earl Mills)
2000 - Geppetto (TV) (Stromboli)
2001 - My Favorite Broadway: The Love Songs (TV) (Himself)
2001 - Ask Me No Questions (TV)
2001 - Ponder Heart, The (TV) (Dorris Grabney)
Voice Acting and Narration:
1981 - Ladies and Gentlemen, the Fabulous Stains (uncredited) (Corinne)
1995 - Chronomaster (VG) (voice) (Milo)
1997 - Star Trek: Generations (VG) (voice) (Lieutenant Commander Data)
1999 - South Park: Bigger Longer & Uncut (voice) (Conan O'Brien)
2001 - Star Trek: Away Team (VG) (voice) (Commander Data)
1995 - Star Trek: The Next Generation - A Final Unity (VG) (voice)
1995 - Chronomaster (VG) (voice) (Milo)
Movies:
1980 - Stardust Memories (Fan in Lobby)
1981 - Rent Control (Leonard Younger)
1981 - Burns's boss (1981)
1989 - Miss Firecracker (Preacher Mann)
1994 - Corrina, Corrina (Brent Witherspoon)
1994 - Star Trek: Generations (Lt. Commander Data)
1996 - Pie in the Sky (Upscale Guy)
1996 - Independence Day (Dr. Brakish Okun)
1996 - Phenomenon (Dr. Bob Niedorf)
1996 - Star Trek: First Contact (Lt. Commander Data)
1997 - Out to Sea (Gil Godwyn)
1997 - Trekkies (Himself)
1998 - Star Trek: Insurrection (Lt. Commander Data)
2000 - Dude, Where's My Car? (uncredited) (Pierre)
2001 - I Am Sam (Shoe Salesman Skylar)
2001 - Dating Service
2002 - The Master of Disguise (Devlin Bowman)
Writer:
2002 - Star Trek: Nemesis (story)