A serial arsonist cold case is reopened when Lt. Severide finds a connection to a recent salon fire. Firehouse 51 celebrates a retirement party.

Jane is having a hard time dealing with Rafael avoiding her, so when an issue with Mateo comes up she uses it to get some face time. Rogelio turns to Jane for help when he learns his pilot is in trouble. Alba and Jorge enlist Xo’s help to study for their upcoming immigration test. Petra finally gets to the bottom of who has been terrorizing her.

Celebrities and their family members show off their culinary skills in exciting challenges for charity. First up: Johnny Weir and his brother Boz go head-to-head with Tara Lipinski and her husband Todd in a fish dish showdown. Then, in a reality TV Blind Taste Test, Lisa Vanderpump and her daughter, Pandora, compete against "Jersey Shore" costars Snooki and JWoww.

Radio show host Howard Stern; Of Monsters and Men performs.

Nadja trains Jenna on how to take her first victim, and Nandor applies for American citizenship.