15 Seizoen
331 Episode
ER - Season 12
- Jier: 2009
- Lân: United States of America
- Sjenre: Drama
- Studio: NBC
- Keyword: chicago, illinois, hospital, doctor, surgical operation, emergency room, medical drama
- Direkteur: Michael Crichton
- Cast: Maura Tierney, Parminder Nagra, Linda Cardellini, Scott Grimes, David Lyons, Angela Bassett