With ER having debuted 25 years ago today, we're revisiting its cast
LOS ANGELES, CALIFORNIA - SEPTEMBER 18: Linda Cardellini attends 'Los Angeles Confidential Magazine celebrates the Emmys with Linda Cardellini' at Kimpton Everly Hotel on September 18, 2019 in Los Angeles, California. (Photo by Emma McIntyre/Getty Images for Los Angeles Confidential Magazine)
LOS ANGELES, CALIFORNIA - SEPTEMBER 18: Linda Cardellini attends 'Los Angeles Confidential Magazine celebrates the Emmys with Linda Cardellini' at Kimpton Everly Hotel on September 18, 2019 in Los Angeles, California. (Photo by Emma McIntyre/Getty Images for Los Angeles Confidential Magazine)
LONDON, ENGLAND - APRIL 28: Alex Kingston attends the British Academy Television Craft Awards at The Brewery on April 28, 2019 in London, England. (Photo by Eamonn M. McCormack/Getty Images)
ANAHEIM, CALIFORNIA - AUGUST 23:Ming-Na Wen, attends D23 Disney Legends event at Anaheim Convention Center on August 23, 2019 in Anaheim, California. (Photo by Frazer Harrison/Getty Images)
ANAHEIM, CALIFORNIA - AUGUST 23: Ming Na-Wen attends D23 Disney Legends event at Anaheim Convention Center on August 23, 2019 in Anaheim, California. (Photo by Frazer Harrison/Getty Images)
HERMOSA BEACH, CALIFORNIA - AUGUST 11: John Stamos attends FOX's Teen Choice Awards 2019 on August 11, 2019 in Hermosa Beach, California. (Photo by Rich Fury/Getty Images)
LONDON, ENGLAND - APRIL 28: Alex Kingston attends the British Academy Television Craft Awards at The Brewery on April 28, 2019 in London, England. (Photo by Eamonn M. McCormack/Getty Images)
NEW YORK, NY - MAY 20: Gloria Reuben attends the 27th Annual Gala Share.Connect.Heal hosted by Vibrant Emotional Health at Cipriani 25 Broadway on May 20, 2019 in New York City. (Photo by Debra L Rothenberg/Getty Images)
NEW YORK, NY - MAY 20: Gloria Reuben attends the 27th Annual Gala Share.Connect.Heal hosted by Vibrant Emotional Health at Cipriani 25 Broadway on May 20, 2019 in New York City. (Photo by Debra L Rothenberg/Getty Images)
PASADENA, CALIFORNIA - APRIL 14: Laura Ceron attends the opening night performance of "Tiny Beautiful Things" at Pasadena Playhouse on April 14, 2019 in Pasadena, California. (Photo by Rachel Luna/Getty Images)
BEVERLY HILLS, CALIFORNIA - MAY 04: Parminder Nagra attends Lupus LA Orange Ball 2019 at the Beverly Wilshire Four Seasons Hotel on May 04, 2019 in Beverly Hills, California. (Photo by JB Lacroix/Getty Images)
BEVERLY HILLS, CALIFORNIA - MAY 04: Parminder Nagra attends Lupus LA Orange Ball 2019 at the Beverly Wilshire Four Seasons Hotel on May 04, 2019 in Beverly Hills, California. (Photo by JB Lacroix/Getty Images)
NEW YORK, NEW YORK - APRIL 08: Lily Mariye attends the AMC Network Summit on April 08, 2019 in New York City. (Photo by Jamie McCarthy/Getty Images for AMC)
HOLLYWOOD, CALIFORNIA - JULY 22: John Stamos and Caitlin McHugh attends Sony Pictures' "Once Upon A Time...In Hollywood" Los Angeles Premier on July 22, 2019 in Hollywood, California. (Photo by Matt Winkelmeyer/Getty Images)
SAN DIEGO, CALIFORNIA - JULY 20: Scott Grimes attends Entertainment Weekly's Comic-Con Bash held at FLOAT, Hard Rock Hotel San Diego on July 20, 2019 in San Diego, California sponsored by HBO. (Photo by Matt Winkelmeyer/Getty Images for Entertainment Weekly)
SAN DIEGO, CALIFORNIA - JULY 20: Julianna Margulies attends Entertainment Weekly's Comic-Con Bash held at FLOAT, Hard Rock Hotel San Diego on July 20, 2019 in San Diego, California sponsored by HBO. (Photo by Matt Winkelmeyer/Getty Images for Entertainment Weekly)
SAN DIEGO, CALIFORNIA - JULY 20: Scott Grimes speaks at "The Orville" Panel during 2019 Comic-Con International at San Diego Convention Center on July 20, 2019 in San Diego, California. (Photo by Amy Sussman/Getty Images)
LOS ANGELES, CALIFORNIA - JULY 18: Noah Wyle attends the Premiere Of Sony Pictures Classic's "David Crosby: Remember My Name" at Linwood Dunn Theater on July 18, 2019 in Los Angeles, California. (Photo by Jon Kopaloff/Getty Images)
LOS ANGELES, CALIFORNIA - JULY 18: Noah Wyle attends the Premiere Of Sony Pictures Classic's "David Crosby: Remember My Name" at Linwood Dunn Theater on July 18, 2019 in Los Angeles, California. (Photo by Jon Kopaloff/Getty Images)
NEW YORK, NEW YORK - JULY 10: Maura Tierney attends the 2019 Amazon Prime Day Concert on July 10, 2019 in New York City. (Photo by Jamie McCarthy/Getty Images)
NEW YORK, NEW YORK - JULY 10: Maura Tierney attends the 2019 Amazon Prime Day Concert on July 10, 2019 in New York City. (Photo by Jamie McCarthy/Getty Images)
LOS ANGELES, CALIFORNIA - JUNE 18: Mekhi Phifer attends Samsung's Galaxy Day Los Angeles Celebration at Goya Studios on June 18, 2019 in Los Angeles, California. (Photo by Emma McIntyre/Getty Images for Samsung)
NEW YORK, NEW YORK - JUNE 11:Actress Julianna Margulies attends the New York Screening of "Jett" - after party at Gitano Jungle Terraces on June 11, 2019 in New York City. (Photo by Bennett Raglin/Getty Images)
LONDON, ENGLAND - MAY 15: George Clooney attends the "Catch 22" UK premiere on May 15, 2019 in London, United Kingdom. (Photo by Stuart C. Wilson/Getty Images)
LONDON, ENGLAND - MAY 15: George Clooney attends the "Catch 22" UK premiere on May 15, 2019 in London, United Kingdom. (Photo by Stuart C. Wilson/Getty Images)
NEW YORK, NEW YORK - MAY 05: Mare Winningham and Anthony Edwards attend the 34th Annual Lucille Lortel Awards on May 05, 2019 in New York City. (Photo by Jemal Countess/Getty Images for The Lucille Lortel Foundation)
SANTA MONICA, CALIFORNIA - MARCH 20: Shane West attends the Ted Baker London SS'19 Launch Event at Elephante on March 20, 2019 in Santa Monica, California. (Photo by Amy Sussman/Getty Images for Ted Baker London)
US/Croatian actor Goran Visnjic attends the premiere of Netflix's "Santa Clarita Diet" Season 3, at Hollywood Post 43 in Hollywood on March 28, 2019. (Photo by Robyn Beck / AFP) (Photo credit should read ROBYN BECK/AFP/Getty Images)
US/Croatian actor Goran Visnjic attends the premiere of Netflix's "Santa Clarita Diet" Season 3, at Hollywood Post 43 in Hollywood on March 28, 2019. (Photo by Robyn Beck / AFP) (Photo credit should read ROBYN BECK/AFP/Getty Images)
LOS ANGELES, CALIFORNIA - FEBRUARY 10: Shane West attends the Universal Music Group's 2019 After Party To Celebrate The GRAMMYs at ROW DTLA on February 10, 2019 in Los Angeles, California. (Photo by Rodin Eckenroth/Getty Images)
LOS ANGELES, CA - MAY 31: Actors Joey Nader and Kristin Minter attend the premiere of "Alex & Me" at the DGA Theater on May 31, 2018 in Los Angeles, California. (Photo by Jesse Grant/Getty Images for Warner Bros. Home Entertainment )
NORTH HOLLYWOOD, CA - NOVEMBER 15: Actress Laura Innes attends the Television Academy's 24th Hall of Fame Ceremony at the Saban Media Center on November 15, 2017 in North Hollywood, California. (Photo by Frederick M. Brown/Getty Images)
NORTH HOLLYWOOD, CA - NOVEMBER 15: Actress Laura Innes attend the Television Academy's 24th Hall of Fame Ceremony at the Saban Media Center on November 15, 2017 in North Hollywood, California. (Photo by Frederick M. Brown/Getty Images)
NEW YORK, NY - FEBRUARY 24: Actor Eriq La Salle attends the 'Logan' New York special screening at Rose Theater, Jazz at Lincoln Center on February 24, 2017 in New York City. (Photo by Nicholas Hunt/Getty Images)
LOS ANGELES, CA - JANUARY 25: Actress Yvette Freeman, winner of Outstanding Performance by an Ensemble in a Comedy Series for 'Orange Is the New Black,' poses in the press room at the 21st Annual Screen Actors Guild Awards at The Shrine Auditorium on January 25, 2015 in Los Angeles, California. (Photo by Ethan Miller/Getty Images)
Actress Yvette Freeman arrives for the 21st Annual Screen Actors Guild Awards, January 25, 2015 at the Shrine Auditorium in Los Angeles, California. AFP PHOTO / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
Actress Yvette Freeman arrives for the 21st Annual Screen Actors Guild Awards, January 25, 2015 at the Shrine Auditorium in Los Angeles, California. AFP PHOTO / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
LOS ANGELES, CA - JANUARY 25: Actress Yvette Freeman, winner of Outstanding Performance by an Ensemble in a Comedy Series for 'Orange Is the New Black,' poses in the press room at the 21st Annual Screen Actors Guild Awards at The Shrine Auditorium on January 25, 2015 in Los Angeles, California. (Photo by Ethan Miller/Getty Images)
NEW YORK, NY - FEBRUARY 24: Actor Eriq La Salle attends the 'Logan' New York special screening at Rose Theater, Jazz at Lincoln Center on February 24, 2017 in New York City. (Photo by Nicholas Hunt/Getty Images)
NORTH HOLLYWOOD, CA - NOVEMBER 15: Actress Laura Innes attend the Television Academy's 24th Hall of Fame Ceremony at the Saban Media Center on November 15, 2017 in North Hollywood, California. (Photo by Frederick M. Brown/Getty Images)
NORTH HOLLYWOOD, CA - NOVEMBER 15: Actress Laura Innes attends the Television Academy's 24th Hall of Fame Ceremony at the Saban Media Center on November 15, 2017 in North Hollywood, California. (Photo by Frederick M. Brown/Getty Images)
LOS ANGELES, CA - MAY 31: Actors Joey Nader and Kristin Minter attend the premiere of "Alex & Me" at the DGA Theater on May 31, 2018 in Los Angeles, California. (Photo by Jesse Grant/Getty Images for Warner Bros. Home Entertainment )
LOS ANGELES, CALIFORNIA - FEBRUARY 10: Shane West attends the Universal Music Group's 2019 After Party To Celebrate The GRAMMYs at ROW DTLA on February 10, 2019 in Los Angeles, California. (Photo by Rodin Eckenroth/Getty Images)
US/Croatian actor Goran Visnjic attends the premiere of Netflix's "Santa Clarita Diet" Season 3, at Hollywood Post 43 in Hollywood on March 28, 2019. (Photo by Robyn Beck / AFP) (Photo credit should read ROBYN BECK/AFP/Getty Images)
US/Croatian actor Goran Visnjic attends the premiere of Netflix's "Santa Clarita Diet" Season 3, at Hollywood Post 43 in Hollywood on March 28, 2019. (Photo by Robyn Beck / AFP) (Photo credit should read ROBYN BECK/AFP/Getty Images)
SANTA MONICA, CALIFORNIA - MARCH 20: Shane West attends the Ted Baker London SS'19 Launch Event at Elephante on March 20, 2019 in Santa Monica, California. (Photo by Amy Sussman/Getty Images for Ted Baker London)
NEW YORK, NEW YORK - APRIL 08: Lily Mariye attends the AMC Network Summit on April 08, 2019 in New York City. (Photo by Jamie McCarthy/Getty Images for AMC)
BEVERLY HILLS, CALIFORNIA - MAY 04: Parminder Nagra attends Lupus LA Orange Ball 2019 at the Beverly Wilshire Four Seasons Hotel on May 04, 2019 in Beverly Hills, California. (Photo by JB Lacroix/Getty Images)
BEVERLY HILLS, CALIFORNIA - MAY 04: Parminder Nagra attends Lupus LA Orange Ball 2019 at the Beverly Wilshire Four Seasons Hotel on May 04, 2019 in Beverly Hills, California. (Photo by JB Lacroix/Getty Images)
PASADENA, CALIFORNIA - APRIL 14: Laura Ceron attends the opening night performance of "Tiny Beautiful Things" at Pasadena Playhouse on April 14, 2019 in Pasadena, California. (Photo by Rachel Luna/Getty Images)
NEW YORK, NY - MAY 20: Gloria Reuben attends the 27th Annual Gala Share.Connect.Heal hosted by Vibrant Emotional Health at Cipriani 25 Broadway on May 20, 2019 in New York City. (Photo by Debra L Rothenberg/Getty Images)
NEW YORK, NY - MAY 20: Gloria Reuben attends the 27th Annual Gala Share.Connect.Heal hosted by Vibrant Emotional Health at Cipriani 25 Broadway on May 20, 2019 in New York City. (Photo by Debra L Rothenberg/Getty Images)
LONDON, ENGLAND - APRIL 28: Alex Kingston attends the British Academy Television Craft Awards at The Brewery on April 28, 2019 in London, England. (Photo by Eamonn M. McCormack/Getty Images)
LONDON, ENGLAND - APRIL 28: Alex Kingston attends the British Academy Television Craft Awards at The Brewery on April 28, 2019 in London, England. (Photo by Eamonn M. McCormack/Getty Images)
NEW YORK, NEW YORK - MAY 05: Mare Winningham and Anthony Edwards attend the 34th Annual Lucille Lortel Awards on May 05, 2019 in New York City. (Photo by Jemal Countess/Getty Images for The Lucille Lortel Foundation)
LONDON, ENGLAND - MAY 15: George Clooney attends the "Catch 22" UK premiere on May 15, 2019 in London, United Kingdom. (Photo by Stuart C. Wilson/Getty Images)
LONDON, ENGLAND - MAY 15: George Clooney attends the "Catch 22" UK premiere on May 15, 2019 in London, United Kingdom. (Photo by Stuart C. Wilson/Getty Images)
NEW YORK, NEW YORK - JUNE 11:Actress Julianna Margulies attends the New York Screening of "Jett" - after party at Gitano Jungle Terraces on June 11, 2019 in New York City. (Photo by Bennett Raglin/Getty Images)
LOS ANGELES, CALIFORNIA - JUNE 18: Mekhi Phifer attends Samsung's Galaxy Day Los Angeles Celebration at Goya Studios on June 18, 2019 in Los Angeles, California. (Photo by Emma McIntyre/Getty Images for Samsung)
NEW YORK, NEW YORK - JULY 10: Maura Tierney attends the 2019 Amazon Prime Day Concert on July 10, 2019 in New York City. (Photo by Jamie McCarthy/Getty Images)
NEW YORK, NEW YORK - JULY 10: Maura Tierney attends the 2019 Amazon Prime Day Concert on July 10, 2019 in New York City. (Photo by Jamie McCarthy/Getty Images)
LOS ANGELES, CALIFORNIA - JULY 18: Noah Wyle attends the Premiere Of Sony Pictures Classic's "David Crosby: Remember My Name" at Linwood Dunn Theater on July 18, 2019 in Los Angeles, California. (Photo by Jon Kopaloff/Getty Images)
LOS ANGELES, CALIFORNIA - JULY 18: Noah Wyle attends the Premiere Of Sony Pictures Classic's "David Crosby: Remember My Name" at Linwood Dunn Theater on July 18, 2019 in Los Angeles, California. (Photo by Jon Kopaloff/Getty Images)
SAN DIEGO, CALIFORNIA - JULY 20: Scott Grimes speaks at "The Orville" Panel during 2019 Comic-Con International at San Diego Convention Center on July 20, 2019 in San Diego, California. (Photo by Amy Sussman/Getty Images)
SAN DIEGO, CALIFORNIA - JULY 20: Julianna Margulies attends Entertainment Weekly's Comic-Con Bash held at FLOAT, Hard Rock Hotel San Diego on July 20, 2019 in San Diego, California sponsored by HBO. (Photo by Matt Winkelmeyer/Getty Images for Entertainment Weekly)
SAN DIEGO, CALIFORNIA - JULY 20: Scott Grimes attends Entertainment Weekly's Comic-Con Bash held at FLOAT, Hard Rock Hotel San Diego on July 20, 2019 in San Diego, California sponsored by HBO. (Photo by Matt Winkelmeyer/Getty Images for Entertainment Weekly)
HOLLYWOOD, CALIFORNIA - JULY 22: John Stamos and Caitlin McHugh attends Sony Pictures' "Once Upon A Time...In Hollywood" Los Angeles Premier on July 22, 2019 in Hollywood, California. (Photo by Matt Winkelmeyer/Getty Images)
HERMOSA BEACH, CALIFORNIA - AUGUST 11: John Stamos attends FOX's Teen Choice Awards 2019 on August 11, 2019 in Hermosa Beach, California. (Photo by Rich Fury/Getty Images)
ANAHEIM, CALIFORNIA - AUGUST 23: Ming Na-Wen attends D23 Disney Legends event at Anaheim Convention Center on August 23, 2019 in Anaheim, California. (Photo by Frazer Harrison/Getty Images)
ANAHEIM, CALIFORNIA - AUGUST 23:Ming-Na Wen, attends D23 Disney Legends event at Anaheim Convention Center on August 23, 2019 in Anaheim, California. (Photo by Frazer Harrison/Getty Images)
LOS ANGELES, CALIFORNIA - SEPTEMBER 18: Linda Cardellini attends 'Los Angeles Confidential Magazine celebrates the Emmys with Linda Cardellini' at Kimpton Everly Hotel on September 18, 2019 in Los Angeles, California. (Photo by Emma McIntyre/Getty Images for Los Angeles Confidential Magazine)
LOS ANGELES, CALIFORNIA - SEPTEMBER 18: Linda Cardellini attends 'Los Angeles Confidential Magazine celebrates the Emmys with Linda Cardellini' at Kimpton Everly Hotel on September 18, 2019 in Los Angeles, California. (Photo by Emma McIntyre/Getty Images for Los Angeles Confidential Magazine)