The Legion of 3 Worlds is a very strange book. It serves as the culmination of various plot threads from Geoff Johns’ runs on Teen Titans, Superman, Green Lantern, and the Flash but has nothing whatsoever to do with Final Crisis, despite the title. Then there’s its stated goal of redeeming Superboy Prime, the villain of two massive DC events (Infinite Crisis and the Sinestro Corps War) and a continuity headache in his own right thanks to his role in Crisis on Infinite Earths. And then of course the book is actually supposed to be about the Legion of Superheroes, and is an attempt to straighten out the three different continuities that exist in the Legion canon.
Can you follow all that? If so this is the book for you. For the other 99% of the population who won’t have a chance of groking this story without a wikipedia IV I think this book will pose a substantial problem.
But credit where its due, the story here holds together remarkably well despite just how much is going on here in so little space. And much of that is due to the legendary George Perez turning in some amazing art work. Throughout the series he has to draw a couple hundred characters, not to mention distinguishing between all the alternate versions of the Legionaires. Its a pretty impressive tour de force and it makes this comic a must read, but really only for the hard core DC fans.