A prank in a high school science class goes terribly awry, injuring a teacher and several students. Hathaway discovers Meg's drug addiction. Weaver and Greene notice Lawrence gets easily confused. Dr. Dave Malucci, an obnoxious second year resident, treats a girl with a facial burn. Elaine returns to the hospital and tells Carter that she's leaving the country to recover after her upcoming breast reconstruction surgery. Later, Carter visits Elaine at home and proves he still finds her sexually desirable.