What We Do is the eighteenth episode of the fifteenth season of the NBC medical drama series ER . It premiered on March 5, 2009.

"What We Do"
Season 15, Episode 18
Air date March 5, 2009
US viewers 8.80 M
Written by David Zabel
Directed by David Zabel
Episode Guide
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A camera crew shooting footage for a documentary interviews members of the ER staff. Detective Claudia Diaz is brought in, critically injured with gunshot wounds. Neela laments the lack of communication between her and Brenner . Sam struggles to reconcile with her mother. Carter's condition worsens quite suddenly.

Cast and CharactersEdit


Parminder Nagra as Dr. Neela Rasgotra

John Stamos as Dr. Tony Gates

Linda Cardellini as Nurse Sam Taggart

Scott Grimes as Dr. Archie Morris

David Lyons as Dr. Simon Brenner

Angela Bassett as Dr. Cate Banfield

Noah Wyle as Dr. John Carter


Justina Machado as Detective Claudia Diaz

Yvette Freeman as Nurse Haleh Adams

Laura Cerón as Nurse Chuny Marquez

Gil McKinney as Dr. Paul Grady

Troy Evans as Frank Martin

Abraham Benrubi as Jerry Markovic

Emily Wagner as Pickman


Amy Madigan as Mary Taggart

Anne Son as Emily Haverman



  • Although listed in the opening credits, Angela Bassett does not appear in this episode.
  • Bernstein: Take it from me--a badge beats a lab coat any day. | Morris: Yeah, yeah. Band of brothers, right? - This exchange takes place when Claudia's partner shows up in the trauma room and things get a little agitated between him and Morris . Scott Grimes , who plays Morris, was one of the main characters (Sgt. Donald Malarkey) in the 2001 HBO mini-series Band of Brothers.


  1. Cancel Bear, The (March 6, 2009). "Ratings: Thursday Competition Glad American Idol Is Leaving ". TV by the Numbers. (May 24, 2015).

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