A chemistry teacher's science experiment goes horribly wrong.
Translators who have aided the U.S. Military in Afghanistan and Iraq are in great danger in their home countries, but red tape is making it impossible for many of them to leave. John Oliver interviews FNU Mohammad, one translator who made it out. Plus, since cameras aren’t allowed in the Supreme Court discussions, most coverage of the important cases looks like garbage. John fixes that problem with real animals and fake paws.
Tommy goes to enter the soapbox derby, and meets an old time greaser in need of help. Grandpa finds the one thing that Mr. Pickles is afraid of.
Peter and Lois decide to open a cookie store, but Peter ruins things when he decides to bring clients in his own way.
In a Halloween-theme episode Bart reads Aramaic symbols from the bottom of his desk and he and Lisa are transported to an alternate world filled with demons. Also, Moe organizes a "Clockwork Orange"-ish gang in which member Dum (Homer) falls for a young lady (Marge) who wants him to quit. In a homage to "The Others," the Simpsons reconnect with their earlier incarnations from the Tracey Ullman era.
Ned and Jesse are forced into an impossible choice - Hani's life in exchange for technology capable of wiping entire cities from the face of the earth.
A returning customer brings in a toy that Walt always coveted; an aspiring student brings in an autographed book.
Simon Bricker returns to Downton to discuss the painting with Cora. Branson makes a difficult decision about Sarah Bunting. Rose encounters a handsome stranger. Determined to stop Isobel making the wrong decision about Lord Merton, Violet enlists the help of Doctor Clarkson. Charles Blake surprises Mary with a cunning plan to help her get exactly what she wants. Mrs Patmore seeks Carson's advice on a financial matter. Inspector Vyner returns with some ominous words of warning for Anna.
Carrie gets a tip from Redmond regarding Quinn's lead. Saul calls in a favor from an old friend in the Pakistani military. Fara uncovers a conspiracy.
Nucky tries to hold onto his assets in Atlantic City; Willie and Eli become involved in Nucky's war.
For their annual Halloween wager, Jake bets Holt that he can steal his watch before midnight, and Gina gets kicked off her dance squad, Floorgasm.
Rick leads a risky mission for a possible small reward when the supplies run low.
The three remaining teams must depict an epic battle between mummies and werewolves, in a challenge featuring guest judge Francia Raisa.
Frank is offered a life-changing opportunity. At the same time, the U.S. Army put Charlie on the hot seat.
Hook discovers that magic always comes with a price after he makes a deal with Mr. Gold to re-attach his hand so that he can embrace Emma with both hands on their first real date. And back in the fairy tale land of the past, Rumplestiltskin uses Anna to help him acquire a magical box from the sorcerer’s apprentice.
When Elizabeth faces the daunting task of negotiating with Iran over their escalating nuclear program, she is determined to deal with the situation in a peaceful manner, despite the President's position of using military action. Meanwhile, Jason has new admiration for his father when he interviews him for a school report.
Things spiral out of control when Rosa finds Summer with her man; Brie learns that Bryan is keeping tabs on her.
Rhythm & Brews, Staten Island, NY. A Staten Island bar that is overrun by customers who are cooking their own food and getting their drinks, due to the employees poor work ethic and the owner's hands off approach in running the bar. Jon must re-ignite the owner's fire and teach the staff why they need to do their own work.