Superman - Action Comics #1
In "Superman Versus the City of Tomorrow," a future Superman and the adult Legion of Super-Heroes crash into the early days of the Man of Steel’s career, setting off a high-stakes mission to reclaim stolen kryptonite hidden in a tesseract implanted in Superman’s own mind. Written by Grant Morrison and brought to life with bold, dynamic art by Andy Kubert, this pivotal issue sees the Legion use their time bubble to infiltrate the past, disguised and determined, as the fate of Earth hangs in the balance. The cover by Rags Morales captures the clash of eras with striking intensity.
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Superman from five years in the future and the adult Legion of Super-Heroes arrive in the early days of Superman's career to recover the kryptonite stolen from the spaceship that brought Superman to Earth. When they discover that the kryptonite is hidden in a tesseract implanted in Superman's brain and is to be auctioned off, the Legionnaires use their time bubble to go back into the immediate past, disguise themselves, and recover the kryptonite to return it to the spaceship.
Plot details indexed by the Grand Comics Database (CC BY-SA).