Stone Boy was among the tryouts that tried to join the Legion of Super-Heroes, but was rejected when his powers to transform him into stone only made him immobile (apparently it seems that he forgot to revert back into flesh). However, Stone Boy and along with several fellow washout tryouts were determined to become actual heroes and formed their own team, the Legion of Substitute Heroes. During the team's first actual heroism against Starfinger, Stone Boy was revealed that he has a no non-sense personality and higher intelligence, which he shares with the team, giving an excellent insight on Starfinger's Ionosphere-gobbling Furries and how to stop them (at this point the Substitutes were surprised that he could actually speak and previously believed that he was mute).


  • Transformation: He can transform into a stone-like form, and become immobile and inflexible. Relatively indestructible.