News of Alex's pregnancy and the mystery of who the father is circles the hospital. Joel returns after his quick incarceration. Maggie studies for the board exam and deals with a patient who has a fear of doctors. Meanwhile, Alex and Dawn continue to deal with their patients in need of a heart donor.

Alex and Maggie perform an intricate procedure; Joel thinks his dad is hiding something; Charlie suspects foul-play when he sees a boy and his grandmother.