Years ago there was a scientist who worked for Stark Inc. Doctor Timothy Gero was a brilliant and promising young man who was said to one day make a breakthrough in the creation of artificial intelligence, to be able to replace the limbs of warred soldiers with artificial pieces, or even programming the consciousness of a human being into a fully operational mechanic body. His creations were going to change the medical and scientific world.
But the man got caught up in his research, instead of wanting to create something that could benefit the lives of humans, he dreamed of creating an army of androids to fight and protect the world under his control.
Stark Inc. closed down his studies, stating that his experiments would prove dangerous for humanity instead of providing them with a promise for the future. He was later fired as he was caught experimenting on human subjects, resulting in failure and death every time.
Driven by his ideal of creating a world filled with artificial beings, he began creating robots that functioned completely under his order, paving the way to creating the perfect, self-functioning androids. His life took an unfortunate twist when his wife fell ill during her last month of pregnancy, passing away right after giving birth. Afraid that his newborn daughter was doing to die from the same illness, he vowed to turn her into the perfect artificial being, the android he had always dreamed of. And way to get back at Stark Inc. for stealing his dream he worked so passionately for during the years he was employed.
S.H.I.E.L.D. received word of his underground experiments and classified it as a threat to humanity, setting off to arrest him. Out of desperation, he blew up his underground lab and disappeared with his daughter, presumably dead.
Years later, New York is plagued by a mysterious group of beings that seem inhuman and it's up to the Avengers to stop the mastermind behind it as he threatens to take over the world and eradicate all human beings.
Takes place in between Avengers Assemble and Avengers: Age of Ultron. Slightly based on the Dr. Gero arc from Dragon Ball Z.