Moe Irvin

The doctors are exposed to flu-infected patients; Derek prepares to give a speech; a new doctor gives Alex a glimpse into an alternative medical practice.

"Grey's Anatomy's" three-episode story arc continues with a part two that will challenge the interns of Seattle Grace -- and "Grey's" fans as well -- like never before.

The residents and interns treat the victims of a massive explosion at an apartment building; Mama Burke returns to collect her son's things; Lexie tries to have a heart-to-heart with unwilling Meredith.

The hospital is hit with an unprecedented crisis; Meredith and Cristina's surgical skills are put to the test.

Meredith Grey and four other first-year surgical interns try to balance life and work at Seattle Grace Hospital.

After a successful operation on his heart, George's father undergoes surgery for his cancer, Thatcher Grey visits Seattle Grace in order to see his new granddaughter, and Meredith discovers that Derek has trouble sleeping soundly. This is Part Two of a two-part episode.