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Gathering everyone, the Chief introduces Gavin and Presley, two visiting firefighters from Toronto who will be observing the firehouse over the next couple of shifts. Before formal introductions can be made, the sirens echo across the kitchen. The crew arrives at Logan Square Station where an energized third rail incident has stopped a train. As the Chief works to shut off the power, Severide, Shay and Dawson free a young boy named Jacob, who's trapped in the tracks, while Mills goes off in search of Jacob's sister Kayla, who was also hit. Minutes later, Casey comes upon Mills in the darkened train tunnel, silently kneeling. He looks ahead to see the body of a girl face down in the tracks, body parts scattered all around the tunnel. Casey solemnly calls for two body bags and puts his hand on Mills, who's speechless.