Atmos

From Who's Who in the Legion of Super-Heroes 1:

History When the ruling Tribune of Xanthu determined that Star Boy's departure from that planet left them at a loss, the planet's top geneticists were ordered to develop a new resident super-hero. They chose a former child actor and amateur athlete, Marak Russen, as the most likely candidate, one already known and popular who would be likely to survive the procedure.

The Xanthian scientists hoped to recreate Star Boy's temporary super-powers by replicating the comet radiation that had once accidentally given him abilities on the level of Superboy or Mon-El. The experiment proved unstable and gave Marak super-powers -- but not the expected ones.

Russen, renamed Atmos, was housed in high style and given the best promotion Xanthian media could provide. His public appearance program and holovised battles so endured him to the Xanthian people that the entire planet was shocked and saddened when Atmos was stolen away, hypnotized, and incarcerated by Universo as part of his "Universo Project," a plan to place all super-powered beings under his thrall. While a mind-controlled prisoner, Atmos had a brief romance with Dream Girl, which is believed to be the motivation for his present attempt to join the Legion. Once Saturn Girl awakened the prisoners, Atmos was the first to leap into battle against their captors.

In Atmos' absence from Xanthu, Star Boy holds the position of planetary champion. If Atmos does not return, it is expected that Xanthu may attempt legal action against him, since his powers were a creation of hig government.

Powers & Skills In addition to the psychological advantage created by Atmos's physical size and unnerving appearance, he has several nuclear-based powers which include flight, greatly-enhanced strength, and a special inhibitor field which gives him partial invulnerability to both physical and energy attacks and the ability to survive exposure to interplanetary space without a transsuit. It also provides him with the ability to project nuclear bolts from his hands. These bolts can melt metals or metallic compounds and generate an electomagnetic field capable of disrupting electronic machinery. At most has not formal combat training, although he has a trained athlete's physique.