This is an amazing book. The reason it’s called “Hulk Gray” is for a few reasons. The number one reason is that this story is the origin of the Hulk, and when he started out, he wasn’t green, he was gray. Also, The Hulk is not a villain or a hero, he’s in between, like gray, between black and white; vague. The last reason (that I can think of) that it’s called Hulk Gray is because the drawings in the book work like this: The flash-backs (practically the whole book) are all color, and the present (the beginning and end section) which is the shrinks office are only black and white.
Basically this book is the origin of the Hulk, being told by Bruce Banner (the Hulk) to his pshychiatrist. I really enjoyed this book and I hope that if you read it you will too.