Emily Harrison

Much to everyone's chagrin, Dr. Archie Morris (recurring guest star Scott Grimes - "Band of Brothers") is appointed as the new chief resident and immediately challenges Pratt as they treat casualties from an apartment building fire. Frustrated at not achieving tenure, Lewis is short-tempered with Carter. Weaver tries to pacify Lewis but only makes things worse. Ray heeds the advice of several doctors at the hospital and discharges a teenaged sickle-cell anemia patient.

While Mac dines at his local breakfast spot, a gunman opens fire, leaving a waitress critically injured and a man dead, and Mac having to choose whether to chase after the suspect or save the life of the young woman. (TV-14)

Will buys his son a cell phone; Kenny screws things up when he meets Jane's parents; Theresa installs a tracking device on Will's phone.