While looking for a distraction on Halloween, Conrad treats a group of witches who send the ER into chaos. Also, Devon treats a patient who thinks he is being haunted by ghosts. Meanwhile, on the way back from his vacation, Bell picks up a hitchhiker who is not what he seems to be.

A new group of interns, which include Billie's son, Trevor, start their first day with Devon at Chastain. Kit and Bell try to convince Conrad to come back to Chastain and The Raptor's mom ends up back in the ER. Meanwhile, Leela and Padma deal with an unexpected visit from their parents.