ER: No Brain, No Gain

Peter becomes obsessed with a baby who is in a critical condition after a surgical error he made and has to listen to the parent's praise for him. Carter clashes with Dale, over a patient who may not have consented to a risky operation, and begins a secret relationship, but who with? Mark battles with his strong feelings towards Susan and gets advice from an anthropologist patient on mating rituals as Susan makes a rather astounding decision about her own future. Meanwhile Carol's worst nightmare comes true in the form of the 'floater' nurse Rhonda's return to ER.