Susan Grace

At a party, Jess and Dean's long-standing animosity erupts into a brawl.

Paul stands in the way of Susan receiving a kidney transplant; Tom passes up a lucrative job to continue working with Carlos; Andrew's alcohol consumption increases, worrying Bree.

Audrey claims that she saw a ghost.

J.D. (Zach Braff) Turk (Donald Faison) and Eliot (Sarah Chalke) quickly become overwhelmed on their first night without the supervision of an attending physician when their newly established authority as residents turns out to be more work than they anticipated forcing them to rely on Carla (Judy Reyes) and even the janitor (Neil Flynn) for assistance. Meanwhile Dr. Cox (John C. McGinley) begrudgingly acquiesces to Dr. Kelso's (Ken Jenkins) request that he introduce him at an awards ceremony fueling Cox's resentment and resulting in a rather unusual presentation.

House believes a patient's seizure was caused by an infection, but the man's sudden heart attack forces the team to change direction and opt for a heart transplant.

Kitty's life is in jeopardy as the Walkers frantically search for a bone marrow donor.