Time travel was a grand pursuit of individuals on both Earths One and Two, and on these worlds two fantastic foursomes fearlessly faced fearsome futures. On Earth-One, Ripley "Rip" Hunter devised a time sphere along with his colleagues Jeffrey Smith, Bonnie Baxter and her brother Corky. Although Hunter the "Time Master" and his friends journeyed backwards and forwards in time, experiencing several adventures in the process, Icy like their counterparts in Rip Carter and the Boy Commandos who had their own unorthodox ,Evans of time travel. And in a future era of the 30th century it would be Brainiac Five and his allies in the Time Institute who would advanced temporal technologies like those of the Time Trust.
Decades earlier on Earth-Two, Doctor Alvin Swanley worked alongside confederates Professor Everson, Professor Zee and Doctor Doome. Professor Zee had aided Earth-Two's Atom and the Society, so had his counterpart Professor Alpheus Hyatt aided Earth-One's Atom and the League.