If Mouch won't come to the mountain, then the mountain is going to come to Mouch.

As Chicago Fire fans already know, the mountain in this scenario is Emmett, Mouch's biological child. After learning that his anonymous sperm donation years ago suddenly wasn't so anonymous, Mouch (Christian Stolte) chickened out from meeting his kid at the last minute.

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In this exclusive sneak peek from Tuesday's new episode (10/9c, NBC), Emmett comes to Firehouse 51 to (finally) meet him face-to-face. However, Emmett drops a huge bombshell in the middle of their meet-cute that throws Mouch for a loop.

Check out the exclusive video below:

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