None of the popular live-action Nick shows from the 2000s to early 2010s had a graduation episode.

I just noticed one subtle pattern with every popular Nick show from the 2000s to early 2010s. None of them ended with an episode where the main cast graduated. Why did I mention this? Because graduation from high school is essentially the conclusion of your teenage years.

Here's the shows I'm talking about and the main plot of their ending. Disclaimer: I didn't watch all of their finales.