Action Comics #6
In "When Superman Learned to Fly," a future Superman and the adult Legion of Super-Heroes crash into the early days of the Man of Steel’s career, chasing a stolen piece of kryptonite hidden in a tesseract implanted in his own mind. Written by Grant Morrison and illustrated by Andy Kubert, with inks by John Dell and colors by Brad Anderson, this 2012 issue blends time travel and mystery as the Legion uses a time bubble to infiltrate the past and prevent the kryptonite from being auctioned off—while the cover by Andy Kubert captures the moment of arrival in dramatic fashion.
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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).