After the main events of Wall-E the axiom sends a beacon to the other BNL Starliners that are in space to convince them to come back to earth they all forgot one simple thing the earth is now overpolluted and irradiated thanks to earth becoming covered in trash and thus all the humans all died the pollution and radiation thanks to earth becoming covered with trash and the end-credits of Wall-E showing the humans rebuilding the earth The Answer. It's happening inside Wall-E's mind after all the humans died from both the pollution and radiation thanks to earth becoming covered in trash Wall-E determined to restore earth back to what it used to be before it became overpolluted and irradiated and covered in trash Wall-E becomes the leader of the machines of the axiom and the machines of the other BNL Starliers and maybe the other surviving robots on earth (assuming Wall-E isn't the only surviving robot and their are other surviving robots on earth outside of Wall-E) all work together to get rid of the trash and cleanse the pollution and clear out the satellite covered sky and get rid of the radiation and restored earth back to what it used to be before it became covered in trash and overpolluted and irradiated and what happened to the fridge that Wall-E found the plant in The Answer. It was the last remaining habitable place on Earth and after Wall-E opened the fridge it became irradiated like the rest of earth and what happened after it was planted at the end of Wall-E The Answer. the plant actually died from the irradiated and what about the Cockroach The Answer. It was actually a Robot No reason for organism (even a cockroach, as "invincible" as they seem) to survive those things OR run as fast as it. And what happened the earth's biosphere The Answer. The earth's original biosphere died from the pollution and radiation thanks to earth becoming covered in trash and it might explain why we see no animals during the main events of Wall-E and the machines of the axiom and the machines of the other BNL Starliners and maybe the other surviving robots (assuming Wall-E isn't the only surviving robot on earth and their are other surviving robots on earth outside of Wall-E) use the terraforming machines that Buy N Large created for Operation Recolonize if Operation Cleanup hadn't failed and nanotechnology that Buy N Large created before the earth became overpolluted and irradiated thanks to earth becoming covered in trash and they use both of them to create a Mechanical Ecosystem version of the earth's biosphere after the earth's original biosphere died from both the pollution and radiation thanks to earth becoming covered in trash and after the earth is restored the machines missed humanity and thus Wall-E got an idea they'll make a civilization that both honors the human race and reflects their uniqueness as machines. As such, many of them adopt an aesthetic reminiscent of the early days of science fiction. These robots take names for themselves, and Wall-E and the machines of the axiom and the machines of the other BNL Starliners and maybe the other surviving robots on earth (assuming Wall-E isn't the only surviving robot on earth and their are other surviving robots on earth outside of Wall-E) terraform modified and enhanced the ruins of human civilization into resembling the towns and cities that we see in Robots. And thus Wall-E and both the machines of the axiom and the machines of the other BNL Starliners and maybe the other surviving robots on earth (assuming Wall-E isn't the only surviving robot on earth and their are other surviving robots on earth) become the founders of a vibrant, colorful world, inspired by human civilization, but populated entirely by robots.