Spoilers below for the One Chicago crossover
The One Chicago crossover was a dramatic and tense three-hours of television that saw Desk Sergeant Trudy Platt “die multiple times” as she was in the operating room.
The first crossover in five years saw the teams of Chicago Fire, Med, and PD come together after an explosion in the basement of a public building leads to mass casualties, evacuations and a tunnel collapse that left first responders trapped on the L train.
The episode began with Chicago Fire, as Firehouse 51 was called to the scene after a gas explosion. Chief Battalion Officer Pascal (Dermot Mulroney) was the incident commander and Squad 3 and Truck 81 were brought in to clear victims and discover the source of the incident.
© Peter Gordon/NBCIt became clear that the data center, located in the basement, was the source of the explosion, and PD’s Sergeant Voight (Jason Beghe) and his team soon realized it was a planned attack when Lieutenant Severide (Taylor Kinney) and Captain Herrmann (David Eigenberg) discovered oxygen tanks.