Billy/Adam
Billy is mentally ill. He has Dissociative Identity Disorder (DID) also known as Multiple Personality Disorder. His alternate personality is the one who has been gaslighting him this entire time.
Billy's alternate personality breaks into Adam's penthouse and steals a handkerchief that used to belong to Hope. When Billy wakes up he has no memory of what he did but when he finds the handkerchief in his pocket, his alternate returns. Expect a dangerous showdown between "Billy" and Adam, and a shocking intervention from a surprise guest.
Nick/Chelsea
Nick is awarded full custody of Christian. Chelsea and Nick celebrate their victory and have sex.
Michael/Chloe/Kevin
Michael arrests Chloe for her 2016 murder attempt on Adam Newman. Kevin punches Michael and gets arrested too. However Michael confides their arrests are just for show and reveals his true plan to help Kevin and Chloe.
B&B continues beating Y&R in the key demo's.
