At some point in his personal timeline, Kang became weary of battle due to frustration and the loss of his son Marcus and consort Ravonna in several timelines. He was approached by the alien Time-Keepers — time travelers from the end of the universe, the last living creatures in existence — to become their agent, preserving timelines rather than conquering them in exchange for immortality. He accepted and reinvented himself again, this time as Immortus, the lord of the other-dimensional realm of Limbo.