Written by Peter J. Tomasi. Art by Carlo Barberi and Matt Santorelli. Cover by Dan Mora. It's the runaway train from hell! Superboy and Robin better hold on for dear life as they ride a 20-megaton cosmic engine of mass combustion (that's a pun!) into their final battle with Rex Luthor! But Rex has got a brand-new army of shiny young super-villains ready to conquer all they survey…will the son of Batman and the son of Superman be enough to stop him?
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