Was Abby's (Maura Tierney) bipolar brother piloting the plane that has plunged into Lake Michigan? As Abby agonizes over this possibility, other dramas play themselves out at the ER. A teenaged driver who may have deliberately run down her taunting classmates is brought in; Chen (Ming-Na) reveals a hidden chapter of her past; and the disabled Romano (Paul McCrane) reacts violently to some bad news about his future as a surgeon. ~ Hal Erickson, Rovi