Hen and Karen are in for quite the shock when they discover what Denny's been up to.
Denny has been keeping a major secret from his parents for months, and when they finally find out what's going on during 9-1-1 Season 6 Episode 13, they are more than justified in their confusion and anger.
TV Fanatic got an exclusive clip ahead of the big hour, which sees Hen and Karen confronting their son over his gigantic secret!
Keeping his newfound relationship with Nathaniel hush-hush has meant Denny having to lie occasionally, and to say Hen and Karen aren't pleased about this is an understatement.
They have every right to be upset and disappointed, and as you'll see in the clip below, they waste no time letting him know what they're feeling.
While in the immediate aftermath of the revelation, they confront Denny first, they will eventually have to have a conversation with Nathaniel as the adult in this whole situation.
Denny is a child and may not fully grasp the scope of his parent's outrage.
There's a lot going on here and a lot of heavy emotions for everyone that we'll see play out during this hour and perhaps beyond.
Elsewhere, Maddie and Chimney will find themselves dealing with a neighbor who's got them scratching their heads a bit.
Being new to the neighborhood, it's always nice to meet those who live close by, but when they get some bad vibes from one of those people, they have to call in the big guns: Bobby and Athena.
We don't often see these two couples hanging out, so it'll be cool to see this dynamic at play, even if the circumstances could be better.
And while everyone is off dealing with their issues, Buck will find himself coming to grips with some new cognitive abilities.
Buck's brush with death has been a huge storyline, and now we'll see more of the fallout from the lightning strike in the form of Buck's new skill set. What will these new abilities mean for Buck moving forward?
Leave your guesses in the comment section below, and let me know what else you're expecting from this hour!
We've got a slew of emergencies on tap and lots of personal plots for our beloved first responders, which amounts to another entertaining episode of the hit series.
Check out the exclusive clip above, and remember to come back here after the episode airs so you can hear our thoughts and share yours as well!
You can catch 9-1-1 Mondays at 9/8c on FOX.
And you can follow our weekly reviews and watch 9-1-1 online right here via TV Fanatic.
Whitney Evans is a staff writer for TV Fanatic. Follow her on Twitter.