In this universe a highly advanced society existed in what was classified as the Fifth Dimension. About a decade ago it was conquered by the mad dictator Xemu who also plotted to invade the Earth. In order to keep his invasion plans a secret, he had agents discourage a housing development in the swamp region where the dimensional pathway existed. These strange happenings attracted the attention Mr. Fantastic of the Fantastic Four who sent the Human Torch to the location to investigate. The Torch was captured by Xemu's men and brought to the Fifth Dimension, where he assisted the locals in liberating their world and overthrowing Xemu before the Torch returned to his own dimension.
Years later, the 5th Dimension was manipulated along with other worlds by Arkon of the planet Polemachus in the Earth dimension. Using a phony company called Inter-Politan Thermo-Dynamics Unlimited, he sold weapons to the people of the Fifth Dimension to defend them from an apparent invasion from Earth-721 in a wider scheme to cause nuclear wars on Earth-616, the Fifth Dimension and Earth-721, thus creating the power needed to renew the dissipating radiation ring around his planet. This plot was thwarted by the Fantastic Four with the aid of Earth-721's Thing.
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