This was subconscious due to the fact that Bruce was ashamed of the dark, not very nice thoughts the Grey Hulk represented and would only let him out at night, in the dark, where he would not be seen. Transformation: Initially, Bruce would transform into the Grey Hulk at night and then back at dawn.This incarnation does possess the 'madder he gets, the stronger he gets' ability, but at a much slower rate, since this incarnation has some level of intelligence and reasoning and would not 'lose control' as easy as the Savage Hulk incarnation. This incarnation can lift approximately 75 tons. Tricky, manipulative, cunning, shows little thought of others, make up some of his traits. This incarnation represents the personality that can do all the not so nice things that Bruce was too unsure of to do himself. David revamped the personality significantly, giving the Grey Hulk the alias ' Joe Fixit', and setting him up as a morally ambiguous Las Vegas enforcer and tough guy. David's stories showed that Banner had serious mental problems long before he became the Hulk. David returned to the Stern and Mantlo abuse storyline, expanding the damage caused, and depicting Banner as suffering dissociative identity disorder (DID). Peter David's run altered Banner's pre-Hulk characterization and the nature of the relationship between Banner and the Hulk. Due to his superior strength, Green Hulk/Savage Hulk, won most of the time thus showing the Savage Hulk persona more often.

His rare appearances are also explained by saying that the Grey Hulk persona and the Green Hulk persona are battling in Bruce Banner's sub-conscious. He also serves as the main protagonist in the second part of the Immortal Hulk comic book series. However, due to Banner's repeated use of gamma radiation projectors, the much better known/more common Hulk Green Hulk/ Savage Hulk emerged. This was explained by saying that the Grey Hulk was the original Hulk to appear when Banner first got hit by the Gamma Bomb. Originally, Stan Lee wanted the Hulk to be grey, but due to ink problems, the Hulk's color turned to green. Michael Donavan ( The Incredible Hulk (1996 animated series))

The incredible hulk what savage beast