NBC has dropped the first trailer for the return of the One Chicago shows!

The trailer includes brand-new footage from the upcoming seasons of Chicago Med , Chicago P.D. and Chicago Fire , all set to premiere on October 1. ( Med premieres first at 8 p.m. ET on Wednesday, October 1, followed by Fire at 9 p.m. ET and P.D. at 10 p.m. ET.)

The teaser hints at some major shake-ups across all three of the fan-favorite shows.

On Chicago Med , Hannah ( Jessy Schram ) faces some drama as her ex Ripley ( Luke Mitchell ) confronts her about her pregnancy, leaving fans wondering if Archer ( Steven Weber ) might be the dad. Find out who is set to return for Season 11 , including an original cast member!

On Chicago Fire , there are big changes to the f

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