Videos: Trailers, Teasers, Featurettes
The twelfth season of the American fictional drama television series ER first aired on September 22, 2005 and concluded on May 18, 2006. The twelfth season consists of 22 episodes.
Streaming, rent, or buy ER – Season 12:
You are able to buy "ER - Season 12" on Microsoft Store as download.