When there is a bounce house crisis at Regular Sized Rudy’s birthday party, the Belcher kids devise a scheme to save the day. Meanwhile, Bob deals with an unexpected guest at the restaurant and is forced to come to terms with a longstanding fear.

When Gene overhears talk about a mystical creature that lives nearby, he leads the Belcher kids and their friends on a journey to find it. Meanwhile, Linda’s competitive nature takes over during downtime at the restaurant.

Axe loses hundreds of millions of dollars on a bad trade and turns to Wendy for help. Chuck sets out on an odyssey to secure powerful allies in the fight against Axe. Lu balks at Lara's suggestion she become the new chef at Axe Capital -- and takes her sister back to the old neighborhood to remind her of their roots. Meanwhile, Sacker and Connerty close down the Axe Capital investigation just as Chuck finds evidence -- right in his own home -- that could salvage the case.

Cooper’s ex-girlfriend resurfaces in a way that results in some serious public humiliation for him. Neal tries to intervene, but things quickly spiral out of control. Meanwhile, Kelly meets a new guy who shares her love of competition and Josh tries his hardest to keep Leslie out of group hangouts.

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The school principal reprimands Hannah; Jessa worries about seeing Hannah at Adam's play; Marnie shares news with Ray; Elijah attends a swanky party at Dill's apartment. Meanwhile, Hannah feels that Fran is judging her.

Emma, Snow, David, Regina, Robin, Henry and Hook continue to search for a way to free everyone from the Underworld. At the mercy of Hades, Gold creates a portal to Storybrooke, which transports Belle, Zelena and Baby Hood to the Underworld. While Zelena and Regina get into a sibling squabble, Belle is reunited with Rumple only to learn some tremendously shocking news that will change her life forever. Meanwhile, Snow and David hopelessly attempt to send a message from the Underworld to their son, Neal. In flashbacks, Hades learns about Zelena’s very special spell and pays her a visit in Oz with the intention of striking an alliance, but finds himself with more than just a partner in crime.

During Fiona's wedding Debbie shows up at the church with Franny, and Frank arrives uninvited and high, and reveals that Sean is still a practicing junkie. Meanwhile, Ian brings Caleb to meet the family; and Sean tries to do everything he can to keep his son in his life.

When Smithers is devastated by Burns’ lack of affection towards him, Homer makes it his mission to find him a boyfriend. Meanwhile, after Bart orchestrates the removal of the lead in the school’s stage production of “Casablanca,” Milhouse serves as a terrible understudy, which frustrates his co-star, Lisa.

To save one of their own, Rick's group must venture outside the walls. Their experience there will change their lives forever.