Er was eens een grijze Hulk

Ook als je in je jeugd flink wat comics hebt gelezen, kun je dus iets missen. Er schijnt ooit een grijze Hulk geweest te zijn. Even gezocht en inderdaad: 

Originally, Stan Lee wanted the Hulk to be grey, but due to ink problems, the Hulk's color turned to green. This was explained by saying that the Grey Hulk was the original Hulk to appear when Banner first got hit by the Gamma Bomb. However, due to Banner's repeated use of gamma radiation projectors, the much better known/more common Hulk Green Hulk/Savage Hulk emerged. He also serves as the main protagonist in the second part of the Immortal Hulk comic book series. 

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. Due to his superior strength, Green Hulk/Savage Hulk, won most of the time thus showing the Savage Hulk persona more often.

(hulk.fandom.com)

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De verbijsterende Hulk vs. X-Factor, nr. 23 (special) 

Juniorpress 88-36, 1988