Things are getting crowded in Chicago!

As you can see in the exclusive behind-the-scenes video below, when all three casts of Dick Wolf's Chicago franchise gather in one room for a huge cast photo, things get silly!

"It's like you're in a frat house," says Chicago P.D.'s Jesse Lee Soffer of the antics the three casts get up to when they're together. "Everyone's just joking around the whole time - we're trying to make serious television here!"

Who is Severide's new love interest on Chicago Fire?

Take a look at the video, which introduces some of the new faces of Chicago Med, along with some characters we've come to know and love from Chicago Fire and Chicago P.D.

Chicago P.D. returns for its third season on Wednesday, Sept. 30 at 10/9c, and Chicago Fire will return for its fourth on Tuesday, Oct. 13 at 10/9c. Chicago Med premieres on Tuesday, Nov. 17 at 10/9c on NBC.

Which of the Chicago shows are you most excited for?