A member of the Legion of Substitute Heroes.

Dag Wentimis the real name of Stone Boy. Stone Boy is a native of the planet Zwen. Because Zwen has a slow rotation, nights on Zwen are half a year long. To compensate for the long nights, natives of Zwen have gained the ability to turn themselves into a stone-like state of suspended animation. While in this state, natives of Zwen cannot move and weigh close to a ton. Dag came to Earth and, calling himself Stone Boy, demonstrated his power for the Legion of Super-Heroes. The Legion ruled that his power was too passive and turned him down for membership in the Legion.

Stone Boy and the other candidates rejected by the Legion that day formed their own group called the Legion of Substitute Heroes. The Subs, as they were called, aided the Legion on a number of occassions.