On Carter's last shift, four new interns begin their tour of duty. After completing their rounds, Carter, Kovac and most of the ER staff head out to Carter's surprise going-away party down the street at Ike's. Ray leaves to go to another party where the revelry is interrupted by a disaster which truly tests his mettle. The casualties are taken immediately to County General where a skeleton staff headed by Abby and Neela must step up to the plate all on their own. Elsewhere, Pratt finally gets the courage to confront his father Charlie. Sam and Kovac search for Sam's son after he runs away in search of his imprisoned father.