It's an IMP-losion of global proportions! As Mxy and Bat-Mite flee the dreaded Doom-Mite of the fifth dimension, Batman and Superman must travel to the fifth dimension to do battle within a dimension of omnipotent mayhem! All this, plus the march of the Legion of Doom-Mites and an absolutely ADORABLE weapon of mass destruction in this startling second installment of the latest World's Finest epic!