Jesse Spencer Jesse Spencer

The men and women of Firehouse 51 has already incurred plenty of injuries this season on Chicago Fire (see also: Mouch and Mills, not to mention the tragic death of Shay). Will Dawson be next?

In this exclusive sneak peek from Tuesday's new episode (10/9c, NBC), Dawson (Monica Raymund) goes missing during the rescue effort at the site of a massive helicopter explosion. And Casey's fears are quickly exacerbated when someone else emerges from the rubble wearing Dawson's mask.

QUIZ: Grey's Anatomy plotline or Florida news story?

"The firefighter who gave me the mask? She fell," the victim tells (Jesse Spencer). So what's stopping Casey from getting to her inside the building? Watch the exclusive video below to find out:

Chicago Fire airs Tuesdays at 10/9c on NBC.