In the first Hulk game you could
play as Grey Hulk and have his own
dialog. Dose Ultimate Destruction
have him like that too?

yeah i think so but you need the cheat

There is Joe fix it and the grey hulk, joe has his own dialouge, but the grey hulk does not.

Joe Fixit is "Grey" Hulk, atleast in the comics. The Hulks in Banner are:

Ordinary Hulk (The green one we all know and love, although origionally made Grey, but it was too dificult in those days, so they changed him to be Green.)

Joe Fixit (The Street Smart Hulk, who is Grey...and stuff)

Professor Hulk (A smart hulk, looks the same as Ordinary Hulk, I think.)

Devil Hulk (The evil Hulk inside Bruce Banner...I think.)

I am hoping you can play as characters other than the different Hulks by using cheats, but I don't know yet.

Other than Joe and the no talking Grey Hulk, you can only change his shorts, play as the abomination in his first form, and as Banner.

Playing as the Devil Hulk would kick ass, though.

You can be grey hulk when u get all the comic books but he doesn't talk like the other game

I played through this game but I haven't read alot of hulk comics. Can anybody tell me the back story of joe fix it?

Plow through this (or use the search function): http://en.wikipedia.org/wiki/Joe_fixit#Gray_Hulk.2FJoe_Fixit