| Season 12 | |
 | |
| No. of episodes | 22 |
| Original network | NBC |
| Original run | September 27, 2005 – May 18, 2006 |
| DVD release | January 12, 2010 |
| Season chronology | |
| Previous Season 11 |
Next Season 13 |
The twelfth season of the medical drama series ER which originally aired from NBC on September 27, 2005 and concluded on May 18, 2006 and spanned 22 episodes. Sherry Stringfield left the show again in this season. This is the last season to have the original ER theme song by James Newton Howard.
Production
Crew
- Main article: Season twelve crew
- [[]] -
Cast and characters
- Main article: Season twelve characters
- See also: Season twelve cast
| Actor/actress | Character | Role |
|---|---|---|
| Goran Višnjić | Dr. Luka Kovac | Chief of Emergency Medicine |
| Maura Tierney | Dr. Abby Lockhart | Emergency Medicine Resident (Year 2) |
| Mekhi Phifer | Dr. Greg Pratt | Emergency Medicine Resident (Year 4) |
| Sherry Stringfield | Dr. Susan Lewis | Departing Chief of Emergency Medicine |
| Parminder Nagra | Dr. Neela Rasgotra | Surgical Resident (Year 2) |
| Linda Cardellini | Nurse Samantha "Sam" Taggart | ER Nurse |
| Shane West | Dr. Ray Barnett | Emergency Medicine Resident (Year 2) |
| Scott Grimes | Dr. Archie Morris | Emergency Medicine Chief Resident |
| Laura Innes | Dr. Kerry Weaver | Chief of Staff |
Plot synopsis
Episodes
- Main article: Episodes
| Season # | Series # | Title | Writer | Director | Original airdate |
|---|---|---|---|---|---|
| 1 | 246 | Canon City | Lisa Zwerling, John Wells, and Joe Sachs | Christopher Chulack | September 22, 2005 |
| 2 | 247 | Nobody's Baby | R. Scott Gemmil | Laura Innes | September 29, 2005 |
| 3 | 248 | Man With No Name | David Zabel | Christopher Chulack | October 6, 2005 |
| 4 | 249 | Blame It On The Rain | R. Scott Gemmil | Paul McCrane | October 13, 2005 |
| 5 | 250 | Wake Up | Janine Sherman Barois | Arthur Albert | October 20, 2005 |
| 6 | 251 | Dream House | David Zabel | Stephen Cragg | November 3, 2005 |
| 7 | 252 | The Human Shield | R. Scott Gemmil | Laura Innes | November 10, 2005 |
| 8 | 253 | Two Ships | Joe Sachs and Virgil Williams | Christopher Chulack | November 17, 2005 |
| 9 | 254 | I Do | Lydia Woodward | Gloria Muzio | December 1, 2005 |
| 10 | 255 | All About Christmas Eve | Janine Sherman Barrois | Lesli Linka Glatter | December 8, 2005 |
| 11 | 256 | If Not Now | David Zabel | John E. Gallagher | January 5, 2006 |
| 12 | 257 | Split Decisions | R. Scott Gemmil | Richard Thorpe | January 12, 2006 |
| 13 | 258 | Body & Soul | Joe Sachs | Paul McCrane | February 2, 2006 |
| 14 | 259 | Quintessence of Dust | Lisa Zwerling and David Zabel | Joanna Kerns | February 9, 2006 |
| 15 | 260 | Darfur | Janine Sherman Barrois | Richard Thorpe | March 2, 2006 |
| 16 | 261 | Out on a Limb | Karen Maser | Lesli Linka Glatter | March 16, 2006 |
| 17 | 262 | Lost in America | Lisa Zwerling | Stephen Cragg | March 23, 2006 |
| 18 | 263 | Strange Bedfellows | Virgil Williams | Laura Innes | March 30, 2006 |
| 19 | 264 | No Place To Hide | Lydia Woodward | Skipp Sudduth | April 27, 2006 |
| 20 | 265 | There Are No Angels Here | R. Scott Gemmil and David Zabel | Christopher Chulack | May 4, 2006 |
| 21 | 266 | The Gallant Hero & The Tragic Victor | R. Scott Gemmil | Steve Shill | May 11, 2006 |
| 22 | 267 | 21 Guns | David Zabel | Nelson McCormick | May 18, 2006 |
