A stormy Thanksgiving workday in the ER results in a cornucopia of milestone events as a thunderstruck Dr. Greene receives disturbing news while a woozy Dr. Corday is sued for malpractice -- and Abby tries to send her unstable mother off, but the broken woman has no place else to go. Dr. Chen is caught by surprise by her high-tone mother who does not know about her pregnancy. Elsewhere: Dr. Benton's pay is docked by Dr. Romano; Dr. Carter chases down an impatient patient who needs immediate treatment; and an explosion rocks the ER.