Prince Brion Marcov, youngest son of the tiny European monarchy known as Marcovia, enlisting the aid of scientist Dr. Helga Jace in giving him earth-based powers to protect his country from the forces of Baron Bedlam. Gaining super-strength, lava blasts, gravity manipulation abilities, he became known as Geo-Force. Joining the Outsiders formed by Earth-One's Batman, Geo-Force in his civilian identity became close friends with fellow Outsider Black Lightning and a college student.
Daniel Dunbar, the young son of a diplomatic couple, was the prized pupil of chemistry teacher Thomas N. Thomas. Together, the pair discovered the ability to charge themselves with positive and negative energy, which when touching matching rings they both wore charged them in their costumed careers. As Dyna-Mite, Dan worked alongside Thomas as TNT, using the super-strength and charged energy blasts wherein they were later asked to join the All-Star Squadron. Eventually, both TNT and Dan migrated from their native Earth-Two to Earth-One, and decades later Dyna-Mite moved to Atlantis as his powers became to great to contain in a normal atmosphere.