Rokk Krinn of Earth-One and Rock Braddon of Earth-Two may have been known by the ladies as gents with a form of magnetic appeal, however the forces of energy at their fingertips were far more potent. While Rokk originated from a world wherein all of its inhabitants could control magnetic forces, Rock utilized equipment to allow him mastery over electro-magnetic forces. Each were mainstays of their respective legions in future eras, leaders among their peers, and had one true love as well.
Both men joined teams of heroes, with Rokk being a charter member of the Legion of Super-Heroes while Rock was a leader of the Space Legion. Each possessed flight belts that allowed them to glide through the air on missions, and while they were both based in their respective world's largest city of the era in Metropolis, they truly made their home throughout the cosmos indeed.