History of character has not yet been written.
- Braalian Physiology
- Non-Metal Materials: Cosmic Boy's power cannot affect non-metals, such as organic substances like wood.
- Cosmic Boy originally appeared in Pre-Zero Hour continuity in Adventure Comics #247 by Otto Binder and Al Plastino. He was introduced in Earth-149 continuity in Superman #149 by Jerry Siegel and Curt Swan.
- This version of Cosmic Boy, including all history and corresponding appearances, was erased from existence following the collapse of the original Multiverse in the 1985–86 Crisis on Infinite Earths limited series. Even though versions of the character may have since appeared, this information does not apply to those versions.
- 3 Appearances of Rokk Krinn (Earth-149)
- 2 Images featuring Rokk Krinn (Earth-149)
- Quotations by or about Rokk Krinn (Earth-149)
- Character Gallery: Rokk Krinn (Earth-149)
Legion of Super-Heroes member