Starring:
Goran Visnjic ... Dr. Luka Kovac
Maura Tierney ... Dr. Abby Lockhart
Mekhi Phifer ... Dr. Gregory Pratt
Parminder Nagra ... Dr. Neela Rasgotra
Linda Cardellini ... Nurse Samantha Taggart
Shane West ... Dr. Ray Barnett
Scott Grimes ... Dr. Archie Morris
Laura Innes ... Dr. Kerry Weaver

Abraham Benrubi ... Jerry Markovic
Natasha Gregson Wagner ... Mary Warner
Garret Dillahunt ... Steve Curtis
Michael Weston ... Rafe Hendricks
Ernie Hudson ... Colonel James Gallant
Sheryl Lee Ralph ... Gloria Gallant

Summary:
Chaos strikes in County General when shots are fired and the gunmen get more and more desperate to make it out of the hospital. Kovac unknowingly puts himself in harms way while Abby is in the line of fire. Meanwhile, Pratt tries to help Neela as she attends to Gallant's concerned parents.

(Temporary summary from IMDB.)