ruck 81 goes out on a call and Truck 66 also goes. Knowing that whoever gets there first will be in charge, Cruz wants to step on it but Casey tells him no. But when they and the other truck crash, one of the other team's members is in critical condition. An initial investigation hints that Cruz was careless. And Walsh and his men are blaming Cruz for the man's condition. When Mills has a fainting spell, Severide tells him to see the doctor. Boden tells Mills that it was his father's wish to reunite with his family. Boden tells Casey there could be a way for Dawson to join the squad but will require a sacrifice on their part.

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