Goofy looking containment suits aside, Reactron and Vulcan were true heavyweights in the supervillain department. Hence why they almost immediately were drawn into conflict with the Girls of Steel. While each formerly serve the government under their name and rank of Sergeant Ben Krullen and Commander Christopher Pike, serving in the military in Vietnam and onboard a spaceship headed for the sun, each cracked under pressure. Exposed to dangerous levels of radioactivity, Krullen from atomic testing and Pike from the sun itself, it was left to the crime syndicate Council and the alien XLK-JNN to provide suits harnessing their abilities.
Krullen's Reactron alter ego iniitally drew the attention of the second incarnation of the Doom Patrol, which were particularly interested in the villain as member Tempest had served alongside Krullen in the military and knew how dangerous he was. Pike's Vulcan immediately returned to Earth-Two to combat his childhood heroes, the Justice Society, whom he blamed for his situation. While Kara Zor-El figured creating a superspeed vortex thrusting Reactron into space would cause him to detonate, Kara Zor-L's teammate Star-Spangled Kid figured a burst of sunlight would cause Vulcan to vaporize. Of course, both criminals would return, but they'd have the prospect of once more facing the Girls of Steel!