The witches prepare for a final epic battle with Michael Langdon. An old face returns to help with the plan.

Firehouse 51 is called in to battle a dangerous structure fire that places everyone in peril. Severide makes a big personal realization. Casey lends another helping hand to Naomi, the investigative reporter.

It’s literally a race against the clock for the BAU to capture the vigilantes behind a series of attacks taking place every 27 minutes in the nation’s capital. Prentiss and Unit Chief Andrew Mendoza lead the effort to identify the Unsubs and what’s motivating them.

In an effort to bridge the gap between Lyon Family Management and Empire, Lucious must play nice with Jeff Kingsley, so that the two companies can get girl group TBD back on the map. Meanwhile, Jamal grows frustrated with Cookie when she tries to steal his London artist, Wynter, out from under him, Andre works with the mother of one of his old inmates to help free her innocent son and Cookie realizes her sister is in danger.

The boys break out of jail and are on the run from the police and ManBearPig. Satan steps up to help the boys and the rest of the citizens of South Park.

An antique store owner is murdered by an evil puppet that begins summoning spirits from hell; Stan brews homemade beer with a debilitating side effect.

Denise believes she's won a contest, but instead gets trapped in the fictional world of Vampire Creek, a TV show about teenage vampires; Stan, Evie and Kevin must find and rescue her before she is turned into a vampire.

Emily brings her mother along with her to Walnut, and Darrell wastes no time finding an advantage. Ivy and Ivy Jr. clean up with their locker. Following on to Whittier, Kenny gets some advice from a music legend.

Out in Hesperia, Mary's transportation troubles lead to teaming up with Kenny and taking him out to pasture. The Vegas Ladies' mid-century style lets them write their own ticket.

Actor Michael Shannon; model Ashley Graham; The Struts and Kesha perform.