For He's a Jolly Good Fellow
composed by Traditional

Nucky celebrates his birthday and uses the event to try and expand his influence over both the Mayor of Jersey City and a United States Senator. Margaret is tasked with delivering a dress to Lucy, and finds solace from her disillusionment by shoplifting lingerie. Chalky exacts revenge on a local Ku Klux Klan leader for a lynching. Jimmy and Capone expand their business operations by taking over territories from a local Irish gangster, resulting in vicious consequences for a prostitute Jimmy was fond of. Luciano takes an interest in Gillian while tracking down Jimmy at Rothstein's request.

Homer goes to a hypnotist and ends up believing he is ten years old. However, when the hypnotist is arrested, Homer becomes stuck in his new age, so he bonds with Bart and refuses entry back into the responsibilities of adulthood. Guest star: Stacy Keach

Frank searches for answers from every religion he can think of, as to why his beloved was taken from him. Sean and Fiona are engaged in their philanderous relationship amidst changing tides at Pasty's. Mickey is now in prison, for Sammi's attempted murder, where he does Russian mafia hits for cash from Svetlana. Carl is released from jail, and his family is treated to his new street refined persona. Lip continues his complicated relationship with teacher, while finding new academic and career aim. Debbie lies about losing her baby to Fiona, only for it to come back and bite her after her boyfriend, Derek, takes off.

Maria 'Mary' Fiore is a San Francisco wedding planner. She is too consumed with planning others' events to worry about her own personal life until she is saved from a nasty accident by Dr. Steve Edison. Mary and Steve spend a wonderful evening in the park, watching an old movie (Two Tickets To Broadway), dancing and nearly kissing before being interrupted by an untimely rain shower. After glowing to her friends that she had finally found a man that she likes, she soon learns that Edison is engaged to her biggest client Fran Donolly. After the revelation, Mary is reunited with a childhood friend Massimo who asks her to marry him; after a slight hesitation, Fiore uses a Scrabble board to spell "OK". Mary reaches the altar with Massimo, but their wedding is halted by her father who knows she is not truly in love with the groom-to-be. Meanwhile, Fran and Steve's wedding fails (due to their own doubts about marriage) and Steve rushes to city hall to try to stop Mary and Massimo's wedding himself. With help from Massimo, Steve finds Mary and asks her to dance at the park where they first met and fell in love.