ByDon (Open): Law and order 1990-2010

https://en.wikipedia.org/wiki/List_of_Law_%26_Order_episodes

This is just a summary of each year. The link takes you to listing of episodes

Partial Listing below, for more goto>
https://en.wikipedia.org/wiki/List_of_Law_%26_Order_episodes

or

C:\Pictures Oldies\#2017\201707\20170709 Law & Order (TV Series 1990–2010)

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Season 1 (1990–91)

Season 1 (1990–91)

The sixth episode "Everybody's Favorite Bagman" was the original pilot made by CBS in 1988, but instead NBC decided to air "Prescription for Death" as the pilot episode of the series in 1990.
George Dzundza (Max Greevey) left the cast at the end of the first season. He was replaced by Paul Sorvino.
S. Epatha Merkerson guest stars as Denise Winters in the episode "Mushrooms". She then joins the main cast as Anita Van Buren three seasons later.
13 episodes (excluding the CBS pilot) were filmed from the spring to the summer of 1990 before being broadcast. 13 episodes were already in can when the show premiered on NBC.

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Season 2 (1991–92)

Paul Sorvino joined the cast as Phil Cerreta.
The episode "The Wages of Love" guest-starred Jerry Orbach as a defense attorney. He became Mike Logan's new partner the next season as wisecracking detective Lennie Briscoe.

Season 3 (1992–93)

Paul Sorvino (Phil Cerreta) left the cast after the episode "Point of View". He was replaced by Jerry Orbach (Lennie Briscoe) who came in during that episode.
Carolyn McCormick joined the cast as Dr. Elizabeth Olivet
Dann Florek (Don Cragen) and Richard Brooks (Paul Robinette) left the cast after the episode "Benevolence;" they both returned in guest roles. Florek was replaced by S. Epatha Merkerson (Anita Van Buren), and Brooks was replaced by Jill Hennessy (Claire Kincaid).

Season 4 (1993–94)

S. Epatha Merkerson (Anita Van Buren) and Jill Hennessy (Claire Kincaid) joined the cast.
Carolyn McCormick (Elizabeth Olivet) and Michael Moriarty (Benjamin Stone) left the cast at the end of the season. Moriarty was replaced by Sam Waterston (Jack McCoy) in season 5.
This season the opening sequence changed to a shorter version with more bass.
Beginning with this season, Florek directed several episodes before joining the cast of its 1999 spin-off, Law & Order: Special Victims Unit.

Season 5 (1994–95)

Sam Waterston (Jack McCoy) joined the cast. Dann Florek reprises his role as Donald Cragen in the episode "Bad Faith".
This is the final season in which Chris Noth was a member of the regular cast as Mike Logan; he later would reprise his character in the TV movie Exiled: A Law & Order Movie in 1998, and on the series second spin-off, Law & Order: Criminal Intent in 2005 until 2008. He was replaced by Benjamin Bratt (Rey Curtis) in season 6.

Season 6 (1995–96)

Benjamin Bratt (Rey Curtis) joined the cast; Richard Brooks reprises his role as former ADA Paul Robinette; and Jill Hennessy (Claire Kincaid) left the cast at the end of the season, with her character being killed.
The season finale episode "Aftershock" was the first and only episode of the entire Law & Order series not to feature a case and instead focus on the characters' private lives. Claire Kincaid is killed in a car accident, injuring Detective Lennie Briscoe.

Season 7 (1996–97)

Carey Lowell joined the cast as Jamie Ross, replacing Jill Hennessy (Claire Kincaid) from the previous season.

Season 8 (1997–98)

This is the first season in the series in which no cast change was made from the previous season.
This is the first season to feature 24 episodes.
This is the final season to feature Carey Lowell in the main cast as Jamie Ross. She would make a guest appearance in an episode in the next two seasons as well as becoming a judge on the series third spin-off, Law & Order: Trial by Jury.

Season 9 (1998–99)

Angie Harmon joins the cast as Abbie Carmichael in this season. Benjamin Bratt (Rey Curtis) leaves the cast after this season but returns in the twentieth season episode "Fed".

Season 10 (1999–2000)

Benjamin Bratt (Rey Curtis) left the cast at the end of the ninth season, and was replaced by Jesse L. Martin (Ed Green) this season. Steven Hill (Adam Schiff) left the cast at the end of the season; he was the last first-season cast member to leave the series.
This was also the season that aired with the creation of the series’ first spin-off Law & Order: Special Victims Unit.

Season 11 (2000–01)

Dianne Wiest joins the cast as Nora Lewin in this season and Angie Harmon (Abbie Carmichael) leaves the series at the end of this season.
This is the first season not to premiere in September.

Season 12 (2001–02)

Elisabeth Röhm joined the cast as Serena Southerlyn (character named after Dick Wolf’s daughter). Dianne Wiest (Nora Lewin) left the cast at the end of the season.
In the aftermath of 9/11, the main title voiceover by Steven Zirnkilton was changed for the first few episodes to include the following dedication: "On September 11, 2001, New York City was ruthlessly and criminally attacked. While no tribute can ever heal the pain of that day, the producers of Law & Order dedicate this season to the victims & their families and to the firefighters & police officers who remind us every day with their lives & courage what it truly means to be an American".
This voiceover was also heard at the beginning of Law & Order: Special Victims Unit and Law & Order: Criminal Intent, whose series premiere was suitably altered to reflect the events; the latter became L&O’s second spin-off.

Season 13 (2002–03)

Dianne Wiest (Nora Lewin) was replaced by Fred Dalton Thompson (Arthur Branch) this season.
"Absentia" was the first episode in the series to have more than 1 director listed.
With the October 9, 2002 telecast of its 279th episode, "Shangri-La," Law & Order surpassed the original Hawaii Five-O as TV's longest-running crime drama in prime-time, breaking a record that stood for 22 years.

Season 14 (2003–04)

This is the second season in the series in which a cast change has not been made from the previous season.
Jerry Orbach (Lennie Briscoe) left the cast at the end of the season. The character Lennie Briscoe retired from the 27th Precinct and was transferred to the series' third spin-off, Law & Order: Trial by Jury, which premiered with L&O next season.

Season 15 (2004–05)

Dennis Farina joined the cast as Joe Fontana this season.
Elisabeth Röhm (Serena Southerlyn) left the cast midway through the season; in the episode "Ain't No Love" she was replaced by Annie Parisse as Alexandra Borgia in the episode "Fluency".
Michael Imperioli temporarily replaced Jesse L. Martin (Ed Green) in the last four episodes as Nick Falco while Martin was filming Rent.
The series' third spin-off was created, Law & Order: Trial by Jury this season. It featured Jerry Orbach reprising his role as Lennie Briscoe, before his death in 2004.
This was the final season to have 24 episodes.

Season 16 (2005–06)

This is the third season in which there were no cast changes in between seasons, as every principal cast member who finished season 15 returned.
- This is Annie Parisse's first full season in the role of ADA Alexandra Borgia. She joined the cast in the 14th episode of the previous season.
Parisse and Dennis Farina (Joe Fontana) leave the cast after the season finale.
Michael Imperioli (Nick Falco) reprises his role in the episode "Hindsight".
Law & Order: Trial by Jury was canceled by the end of the 2005–06 season, only lasting one season.

Season 17 (2006–07)

Alana de la Garza (Connie Rubirosa) and Milena Govich (Nina Cassady) joined the cast.
Fred Dalton Thompson (Arthur Branch) and Milena Govich left the cast after the season finale. Govich was replaced by Jeremy Sisto (who guest stars as a defense lawyer in the episode "The Family Hour") who joined the cast as Cyrus Lupo in the next season.

Season 18 (2008)
Main article: Law & Order (season 18)

    Jeremy Sisto (Cyrus Lupo) and Linus Roache (Michael Cutter) joined the cast.
    Jesse L. Martin (Ed Green) left the cast and was replaced by Anthony Anderson (Kevin Bernard) in the episode "Burn Card".
    Production of the eighteenth season was interrupted by the 2007 Writers Guild of America strike when executive producer René Balcer and the rest of the writing staff participated in the work stoppage, making this season the first to start in January.

Season 19 (2008–09)
Main article: Law & Order (season 19)

    This was the fourth season with no cast changes from the end of the previous season, and it was the first season to start in November.
    During this season, Law & Order: UK made its début in the United Kingdom on ITV1.
Season 20 (2009–10)
Main article: Law & Order (season 20)

    This was the fifth (and final) season in which the series had no cast changes from the previous season.
    Benjamin Bratt (Rey Curtis) reprised his role in the episode "Fed".
    Prior to the show's cancellation, S. Epatha Merkerson (Anita Van Buren) announced she was leaving the cast in the season finale after playing her character for sixteen years, the 20th season being her 17th season.[109]