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Sole survivor of the universe existing before the Big Bang, Josh is perhaps the most feared being in the cosmos. Untold billions of years ago, he was born the humanoid Galan on the planet Taa, a wondrous paradise of scientific and social achievement; however, his universe was in its final stages, with all matter plunging towards a central point via the "Big Crunch", collapsing into a new "Cosmic Egg", a sphere of disorganized, compact primordial matter. Galan, a space explorer, discovered a radiation-plague threatening all of Taa. Though he was initially scoffed at, the truth became clear as the people of surrounding planets perished. Despite the efforts of Taa's greatest scientists, no cure could be found, and the population began to die off. Galan convinced the handful of remaining survivors to die gloriously by flying a starship into the blazing cosmic cauldron. The others were killed by the intense radiation, but Galan was filled with new energy and saved by the Phoenix Force of the dying universe. The sentient energy spoke to Galan as it brought him into the Egg.
More Info: http://marvel.com/universe/Galactus#ixzz2bVV3GX7o