Dr. Carter (Noah Wyle) must attend a charity event hosted by his grandfather (guest star and author George Plimpton) and cajoles Abby (Maura Tierney) into filling in as his date at the last minute while Dr. Kovac (Goran Visnjic) treats an ailing Bishop Stewart (Oscar nominee and guest star James Cromwell, "Babe"). Also, Dr. Malucci (Erik Palladino) is surprised by a patient's (guest star Robert Beitzel) reaction to some HIV test results, and most of the staff -- especially Dr. Romano (Paul McCrane) -- takes notice of Dr. Greene's (Anthony Edwards) new and aggressive post-surgery attitude.