Marak Russen (Pre-Zero Hour)

Unique Physiology: Xanthian scientists hoped to recreate Star Boy's super-powers by replicating the cosmic storm that accidentally gave him enhanced abilities. The experiment worked but caused unstable and unexpected reactions.^[1]
- Flight: Atmos' abilities are nuclear in nature allowing him to expend energy in various ways such as flying.^[1]
- Superhuman Strength: Atmos' strength also comes from the nuclear reactions inside his body.^[1]
- Invulnerability: Atmos' body is surrounded by a special inhibitor field that protects him from physical and energy based attacks.^[1]
  - Energy Resistance^[1]
  - Interstellar Travel^[1]
- Energy Projection: His most destructive nuclear ability is to fire bolts of nuclear energy from his hands. These bolts can melt metals and cause electronics to malfunction.^[1]

Intimidation: Atmos' size and appearance, as well as his acting skill, make him an intimidating opponent to face in combat.^[1]

Trivia

Marak Russen, as Atmos, is the "Champion of Xanthu" in lieu of Star Boy.^[1]
Atmos has once had an brief romantic relationship with Dream Girl which prompted him to attempt to join the Legion of Super-Heroes.^[1]