This episode was a conclusion to the semi revealing Mysterion/Coon trilogy. I have to admit I was a bit underwhelmed with the conclusion since Kenny is my favorite character however there were some really funny moments like Cthulu killing Justin Beiber and Mint Berry Crunch ultimately saving the day (I saw that coming but it was still hilarious)
There were some plot points that were completely left out like BP Oil and Captain Hindsight but something tells me Captain Hindsight will return.
As for Kenny, though I thought he was not given justice back-story wise, I thought he was given justice in terms of personality. He's not just that side character who dies or gives into sexual activity. He's determined, brave, and very aggressive in a funny way of course. Hopefully in future episodes Mysterion will come back and Kenny will be fleshed out more.