Michael Hogan

Just when Derek's condition seems to be improving, a severe complication arises; when Cain's former girlfriend is admitted to the hospital for surgery, the doctors finally get a glimpse into his personal life.

Conrad brings a patient into the hospital who causes a security crisis; an MMA brawl sends a well-known fighter to Chastain and all hands are on deck; Bell and Raptor vie for the same position at the hospital; Leela gets a visit from her sister.

While looking for a distraction on Halloween, Conrad treats a group of witches who send the ER into chaos; Devon treats a patient who thinks he is being haunted by ghosts; Bell picks up a hitchhiker who is not what he seems.

A new group of interns, which includes Billie's son, start their first day; Kit and Bell try to convince Conrad to come back to Chastain; Leela and Padma deal with an unexpected visit from their parents.

Chastain picks up the pieces after the fallout with the corrupt medical device company Quovadis; Conrad and Alec team up to help a young gymnast experiencing mysterious symptoms; Bell rushes to Kit's aid.

Conrad must diagnose a young woman who gets admitted after having extreme night terrors; Devon faces his first Halloween in the emergency room; Nic panics over her decision to bring her newly sober sister to Mina's epic annual Halloween party.