GREY HULK Professor
The Incredible Hulk Vol.1 #1
Hulk in the beginning was gray, not green. Stan Lee (Hulk's co-creator), reveals that his original intention was to make him gray. But since the printers of that time (1962) did such a lousy job with that color, he decided to change it to green, just like that. The gray Hulk only appeared in the debut, and was "resurrected" many years later.
The Gray Hulk is weaker than the Savage Hulk (initial strengh is around 70 tons). Although he gets stronger as he gets angrier, the Gray Hulk's strength does not increase as fast as the Savage Hulk's. The Gray Hulk is also shorter than the Savage Hulk.
But his intellect is that of a normal human being, winning over the Savage Hulk in this aspect.
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The Incredible Hulk Vol.2 #377
This incarnation was first revealed to be the merging of the Bruce, Savage, and Gray personas. Thus it was known as the Merged Hulk. But it was later revealed (writer Paul Jenkins) that the Professor was in fact a new Hulk incarnation created by Doc Samson to stableize the Multiple Personality Dissorder (MPD) of Robert Bruce Banner.
The Professor has Banner's genius intellect, the Savage Hulk's strengh (initial strength level which is around 100 tons), and the Gray Hulk impetus. He's taller and broader than the Savage Hulk. At first it seems like the perfect incarnation. But it is more vulnerable than the Savage Hulk (it's been hurt often), and it cannot reach the level of strenght of the Savage Hulk either because Banner is in control.
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