While picking up some food supplies Clarke runs into some looters.

Season 2 Episode 13 'Tonight is the Night'
During a frigid, cold night in Chicago, Firehouse 51 responds to a car accident when a blackout occurs and leaves an entire district without electricity or power. The men are swamped when locals flock to firehouse seeking a warm place during the blackout. Clarke gets caught up in a looting and held at gunpoint while getting supplies at a store and Boden has to deal with unwelcome guests at the firehouse. Casey struggles with memory loss and headaches. Severide's sister Katie goes missing. Herrmann, Dawson and Otis continue to debate on future plans for Molly's.

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