This week: Pratt does his best to prove he's an asshole, Abby has a rocky return to work after her kidnapping, Luka and Sam give us a clear example of a toxic relationship, the staff deals with a case of mistaken identity, Neela makes some missteps when dealing with an injured girl in foster care, Kerry keeps bringing up patient satisfaction scores, and everyone's favorite sleazy lawyer makes his presence known both inside and outside the ER.