The ER is kept hopping by a spectacular traffic accident, which the wife of the driver blames on an "insane" car. Meanwhile, the burden of keeping Burke's hand tremors a secret is taking its toll on Cristina (Sandra Oh). Also, despite being on probation, Izzie (Katherine Heigl) cannot help but meddle in the matter of George's heart-patient father. And as for George (T.R. Knight), he has gotten on Burke's bad side by calling in Dr. Erica Hahn (Brooke Smith) as surgical consultant--the same Erica Hahn who made life miserable for Burke in med school, and who seems poised to do the same all over again at Seattle Grace. ~ Hal Erickson, Rovi