Below the Belt – Johnson tries to find a cure for Masters’ sexual difficulties; Masters learns of a rival study and tries to brand his work; Flo informs Langham that he must have sex with her in order to keep his job; Barbara and Lester connect over their shared sexual dysfunctions; Libby asks Johnson to give her an alibi while she canvases a tenement for a rent strike with CORE.
The Second Coming – In Los Alamos, even small favors can lead to big trouble. Abby breaks the rules.
Loved Ones – Eph investigates Kelly’s disappearance. Meanwhile, Dutch retaliates against Palmer; and Fitzwilliam makes a surprising choice.
Truth Be Told – Alison follows up on James evidence. Vanessa discovers Darius’ plan. Kyle finds out the MayTwos’ real agenda.
DOA – Season 3 ends with Carrie being unable to utilize her perfect memory after an assassin slips her a potentially fatal dose of poison that attacks her brain. Al desperately searches for an antidote.
Smells Like King Spirit – Tarkoff takes revenge against Frederick; Freya confronts Killian; Ingrid gives Dash an ultimatum; Wendy and Tommy’s relationship proves dangerous; Joanna takes action to protect her family.
A Boy Named Michael – After seeing how sophisticated Greg & Terry’s life is, he decided to move in with them.
The Good Listener – Nucky visits Johnny Torrio in New York City to discuss his close call in Cuba and find out if new Mafia boss Salvatore Maranzano had anything to do with it. Meanwhile, law-school graduate Willie has a job interview; Eli and Nelson’s liquor stash is raided by Eliot Ness in Chicago; and Joseph Kennedy listens to Nucky’s pitch for post-Prohibition prosperity. Also: A young Nucky and his family mourn the loss of his sister, Susan, in 1884.
Volcheck – Ashley’s stalker, Bob Lepecka, returns and makes trouble for Steve Knight. Meanwhile, Cochran is officially nominated for the FBI directorship and tries to protect himself from the vetting process; Kate confronts Ray about his past; and Mickey gathers a team for his pot store robbery.