Survivors in the Mutated Lands

Nine centuries ago, mutants destroyed civilization with nuclear explosions. Land and life changed drastically as an alien DNA that started the mutant revolution ran rampart over all those years. History was forgotten and new life grew from the ruins. Eventually, humans and mutant kind learn to work together to survive the sometimes hostile lands. But there were survivors of the mutant dawn, and they figured out how to survive underground by placing their brains in robotic bodies.
They slept for all those centuries and returned to the surface to regain control in the name of humans. They would hit innocent villages and kill all the mutants while taking all the humans underground. Their fate was unknown. The one survivor was a former South African spy named Marty. He had helped the former Secretary of State Burt Isabela escape the destruction and get to an underground super bunker.
He was the prototype to have his brain placed in a robotic body and helped the secretary survive a coup by the military to take over the bunker. But trust and fate were not on his side, as he had his arms and legs cut off and placed in a hut on the surface. His prison was his body. A mixed group of humans and mutants are in route to investigate the rumors of raiders destroying villages in Slimnorah, formerly known as Minnesota.
This group was made of an interesting bunch of characters. A reptilian mutant with secret ambition; a rumored legendary mutant with a mysterious past; a young woman with no memory and a floating neutron bomb to keep her heart beating; an insane human scientist who thinks his wife is the device he carries on his back; a wolf man of great strength; a human thief with secrets; and a mutant assassin there to kill someone in the group; two air-breathing fish mutants and a plant man, to name a few.
They encounter strange wildlife as well as people and mutants with agendas that help and hinder their progress to Slimnorah. The confrontations along the way come from both outside the group and inside of it. Trust is earned and respect is warranted to survive the challenges along the way.