Ulu Vakk of Lupra worked as a lab assistant. While working under the direction of the facilitie's chief scientist, he was struck by a beam of multi-colored light that originated from another dimension. The exposure granted him the power to alter the color of any object.
He traveled to Earth to try out for the Legion of Super-Heroes. Due to the sever its limitation, his power was deemed useless and his application was rejected. He was then approached by the Legion of Substitute Heroes and offered a spot with them. He accepted and joined the subs.
- 32 Appearances of Ulu Vakk (Pre-Zero Hour)
- 2 Images featuring Ulu Vakk (Pre-Zero Hour)
- Quotations by or about Ulu Vakk (Pre-Zero Hour)
- Character Gallery: Ulu Vakk (Pre-Zero Hour)
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Legion of Super-Heroes member