When a man who thought he was abducted by aliens is murdered, his body is stolen from the coroner's van; Van Pelt looks for a wedding dress.
After Platt is physically assaulted while getting into her car, she's rushed to Chicago Med, where Mouch finds himself being questioned; Antonio and the team look for previous threats against Platt.
Frank works to vindicate Detective Douglas McKenzie (Mike Carlsen), a detective accused of using excessive force. Also, Danny and Baez track down the killer responsible for the death of a rapper's bodyguard; Jamie is skeptical about a relationship between Espinoza (Luis Antonio Ramos) and a new rookie officer, Sarah Brooks (Lily Brown); and Eddie goes undercover to help Erin investigate a mysterious cult.
When Beckett and Castle respond to an "officer down" call, they discover the victim is actually a male stripper dressed as a cop.
A Blacklist case becomes personal for Agent Park when the team investigates a mysterious disappearance in the Alaska Triangle; Aram enlists Red's help to find out what really happened to Elodie's husband.