The Legion of Super-Heroes in the 31st Century #15

Synopsis

While playing virtual reality games, Bouncing Boy and Triplicate Girl suddenly find themselves in a virtual Keystone City of the 21st century, where a boy named Bart is being trained to control his special abilities. Bart thinks the Legionnaires are reponsible for the disappearance of elements of his virtual world, but Brainiac 5 helps them track down the real culprit and restore Bart's world.