Grey's Anatomy: 7.02 'Shock to the System' - Episode Description

 GREY'S ANATOMY - "Shock to the System" -- After weeks of concealing the fact she was pregnant and miscarried, Meredith at last tells Derek and is finally cleared to return to her surgical duties in the wake of the hospital shooting spree; Cristina experiences post-traumatic stress disorder in the midst of an operation; and Bailey refuses to let Alex operate until he agrees to have the bullet in his chest removed, on "Grey's Anatomy," THURSDAY, SEPTEMBER 30 (9:00-10:01 p.m., ET) on the ABC Television Network.

Guest cast includes James Tupper as Andrew Perkins, Ashley Crow as Linda, John Walcutt as Paul, Camille Chen as Kerry, Walter Perez as Russ, Chuck Hittinger as Mitch and Eric James Ramey as Warren.

"Shock to the System" was written by William Harper and directed by Tom Verica.