Kara Killmer's final episode of Chicago Fire is almost here and the photos from Brett and Casey's (the returning Jesse Spencer) wedding are in! If we had to describe the wedding in one word other than beautiful, it would have to be fun! And these first responders deserve to have some.

In the February 28 episode, "Port in the Storm," familiar faces return for Brett and Casey's wedding, which is held at a venue Violet (Hanako Greensmith) is eager to decorate. (It was at the end of the previous episode that Brett realized she'd booked a fish store, not Shedd Aquarium.) Plus, a phone call at the expo center takes a shocking turn. We'll have to wait to find out exactly what happens there and who's involved in that rescue.

The NBC sneak peek footage for the episode is almost entirely from the wedding—Boden (Eamonn Walker) is the registrar, with Severide (Taylor Kinney) as best man and Violet as best man—and the reception (just look at that cake!). And the joy is clear on everyone's faces.

We also get a glimpse of Casey back at 51, with Boden and the meeting of Trucks newest member, Gibson (Rome Flynn), who in the previous episode opened up about his tragic past to Carver (Jake Lockett). In a boxing match, he punched an opponent so hard that he died. While dealing with that, Gibson realized he wanted to be a firefighter. Carver told him he was in the right place, and perhaps Casey will have some words of wisdom or echo that sentiment in their conversation.