Legion of Darkness - Farshtey, Greg

On the run, Speeda Demon realizes that the only way to keep Hero Factory from getting him is to get them first. From every corner of the galaxy, he assembles an army of criminals. Their mission: wipe Hero Factory right off the map.

Legion of Darkness 2012, Scholastic, New York

ISBN-13: 9780545465175

Trade paperback

Legion of Darkness 2012, Turtleback Books, New York

ISBN-13: 9780606267694

Turtleback School & Library edition