>>110386433In the final episode, Zim becomes an actual threat and takes over the world, perhaps becoming/merging with advanced AI or some kind of eldritch abomination, discovers the truth at some point and becomes a threat even to the Irken Empire, and takes over Earth, turning into even more of a crapsack totalitarian nightmare world, and is either toying with and torturing Dib a la I Have No Mouth and I Must Scream, or else Dib is leading a real resistence (or some combination of the two), which leads into a new show with that as the main premise.
And that show would be to Invader Zim what Dragon Ball Z is to Dragon Ball.