The kids should have done nothing and let the planets merge.

The Mind Flayer proved to be an extremely weak opponent after it got beat by a group of kids and some Molotov cocktails. They should have let him merge the planets then had the army blow it with a few bombs or something. They could have doubled the rss for the human race and gave us so much more land. Plus any elements they may have discovered that we don’t know about. They basically cost us unlimited resources and the chance to learn so much more about the universe.