Randall adjusts to the foster system, Kate and Toby take the next step in their relationship, Kevin visits Sophie in New York, and Jack and Rebecca finalise Randall's adoption.
A mystery patient wanders from room to room through the hospital and continually breaks into song, and Dr Greene suspects that a man is beating his wife.
The FBI profilers head to Santa Monica, where a string of burnt bodies are found around the landmark pier. Rossi is also reunited with his former marine sergeant.
Dr Greene is forced to bring his young daughter to work with him, and Dr Greene and Dr Ross struggle to save an inner-city child who ingested cocaine.
Lewis clashes with the new chief resident; Ross treats a child pyromaniac; Hathaway rides ambulance duty with a handsome paramedic.
