the Hulk than without, the two joining forces to thwart the Doombots' attempt to use the animals on Banner's irradiated island as the basis for a new gamma army using a one-of-a-kind gamma cure Banner had created to turn all the animals back to normal. Following this, Bruce willingly joined the spy organization S.H.I.E.L.D., allowing them to use the Hulk as a weapon in exchange for providing him with the means and funding to create a lasting legacy for himself. After the Hulk had suffered brain damage upon being shot in the head by the Order of the Shield- the assassin having been carefully trained to target Bruce at just the right part of the brain to incapacitate him without triggering a transformation- Iron Man used the Extremis to cure the Hulk. This procedure also increased Banner's mental capacity, which gave him the intelligence to tweak the Extremis virus within him and unleash a new persona for the Hulk: the super-intelligent Doc Green. During the 2014 "Original Sin" storyline, Bruce Banner confronted by the eye of the murdered Uatu the Watcher. Bruce temporarily experienced some of Tony Stark's memories of their first meeting before either of them became the Hulk or Iron Man. During this vision, Bruce witnessed Tony modifying the gamma bomb to be more effective prompting Bruce to realize that Tony was essentially responsible for him becoming the Hulk in the first place. Subsequent research reveals that Tony's tampering had actually refined the bomb's explosive potential so that it would not disintegrate everyone within the blast radius, with the result that Tony's actions had actually saved Bruce's life. In the 2014 "AXIS" storyline, when a mistake made by the Scarlet Witch causes various heroes and villains to experience a moral inversion, Bruce Banner attended a meeting between Nick Fury Jr. and Maria Hill of S.H.I.E.L.D. and the Avengers who refused to turn over Red Skull. Later when he sided with Edwin Jarvis and tried to prevent his teammates from executing the Red Skull, the Hulk was thrown aside by Luke Cage. The Hulk's sorrow at his friends' betrayal awakened a new persona known as the bloodthirsty Kluh (described as the Hulk's Hulk, being the ruthless part of himself that even the Hulk repressed) with this new version easily defeating the Avengers, sneering that the Hulk they knew was nothing more than a "sad piece of 'Doc Green's' ID."