Legion of Super-Heroes in the 31st Century 20 page 7

Published 2009
Metallo 3000
written by Jack Briglio

As dream Girl has predicted, Metallo using a Kryponite powered suit, attacks Superboy.

Note in this book and the cartoon series, he is referred to as Superman. There were two reasons that happened on the TV show. One was that at the time, DC was involved in litigation with the the estates of Jerry Siegel and Joe Shuster over the ownership of the Superboy name. Additionally, the Superman Returns movie was released in June 2006 and there was a desire to catapult off the publicity for the film.