Brent Spiner (Data) appeared in the 2004 episode of Law and Order Criminal Intent, 'Shrink Wrapped' as the character Graham Barnes.
Colm Meany (Chief Miles O'Brien) appeared in the 2005 two part episode of Law and Order Criminal Intent 'In the Wee Small Hours' as Judge Harold Garrett and the 2008 episode of Law and Order 'Lost Boys' as the character Wyatt Landon.
Denise Crosby (Lt. Tasha Yar) appeared in the 2011 episode of Law and Order: LA 'Big Rock Mesa' as the character Diana Burt.
And my favorite, Whoopi Goldberg (Guinan) appeared in the 2006 episode of Law and Order Criminal Intent 'To The Bone' as the character Chesley Watkins. A chilling performance.
I believe you are referring to Warf from Star Trek: The Next Generation. This character is played by Michael Dorn.
Star Trek: The animated Series (1973) Star Trek: The Next Generation (1987) Star Trek: Deep Space Nine (1993) Star Trek: Voyager (1995) Star Trek: Enterprise (2001)
The Captain of the Enterprise in Star Trek: The Next Generation is Jean-Luc Picard!
Debra Dilley has: Played Klingon Pilgrim in "Star Trek: The Next Generation" in 1987. Played Operations Division Officer in "Star Trek: The Next Generation" in 1987. Played Borg in "Star Trek: The Next Generation" in 1987. Played Command Division Officer in "Star Trek: The Next Generation" in 1987. Played Sela in "Star Trek: The Next Generation" in 1987.
Arvo Katajisto has: Played Romulan in "Star Trek: The Next Generation" in 1987. Played Devidian Man in "Star Trek: The Next Generation" in 1987. Played Ensign Torigan in "Star Trek: The Next Generation" in 1987. Played Romulan Guard in "Star Trek: The Next Generation" in 1987. Played Castle Courtier in "Star Trek: The Next Generation" in 1987. Played Klingon in "Star Trek: The Next Generation" in 1987. Played Security Guard in "Twin Peaks" in 1990.
Star Trek: The Next Generation
Star Trek: The Next Generation
Lt. Commander Data is the main android character in Star Trek: The Next Generation.
John. Eaves has written: 'Star Trek, the next generation sketchbook' -- subject(s): Star Trek films, Star trek, the next generation (Television program)
Star Trek: The Next Generation (1987-1994) Correction!: Star Trek: The Animated Series (1973-1975)
Star Trek: The Original Series Star Trek: The Animated Series Star Trek: The Next Generation Star Trek: Deep Space Nine Star Trek: Voyager Star Trek: Enterprise Star Trek: Bridge Commander (TV Series)
Star Trek The Next Generation - 1987 was released on: USA: 26 September 1987