Abby's (Maura Tierney) overbearing mother (guest star Sally Field) arrives at the hospital to comfort her and Dr. Kovac (Goran Visnjic) as their son's life hangs in the balance. Sam (Linda Cardellini) returns to Chicago but fears that police will arrest her despite her claims of self-defense. Paramedic Tony Gates (John Stamos) makes a risky decision with an overdosed teen. Later, Gates escorts a very drunk Neela (Parminder Nagra) home after drowning her sorrows at the local bar.