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Bart inherited super-speed from his grandfather, Barry Allen , but his hyperaccelerated metabolism resulted in an accelerated growth rate. To keep him from going insane, scientists placed him in a virtual reality that kept pace with his own scale of time. Eventually it became clear that their efforts were not helping, so Bart's grandmother Iris took him to the 20th Century to consult her nephew, Wally West . Wally knew from experience the practicalities of super-speed in the field, unlike the scientists who had only observed it in the laboratory. After Wally's encounter with the speed force , Max Mercury became Bart's guardian and trainer.