Worldbreaker Hulk is a name given to the beastial form of Bruce Banner. In fact, his transformations often take place when he is not in control of himself and during periods of extreme rage.
Bruce Banner has transformed into the World Breaker Hulk four times in Marvel Comics history, however only three are accounted for so far. First Appearance was in the Incredible Hulk issue #258 where Bruce had just started working at a construction site and inexplicably experienced another transformation from Dr. Banner to World Breaker Hulk. He reverted back to Dr. Banner which terrified him as no other ordinary man ever survived taking on that body’s power before and it left still him even more perplexed for its safety on Earth than he already had been .
