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1. Grey Hulk.
2. Savage Hulk.
3. World War Hulk.
4. Worthy Hulk.
5. World Breaker.

Fight on an indestructible 2d plane that extends infinitely in all directions and acts as their floor.

So many different versions(most of which I don't even know), so much power variance. Sometimes the Hulk punches continents apart, sometimes he gets chocked out by a python.

Worthy Hulk is, imo, the greatest threat, given that he is the only version that Sargeras can't simply bfr if things begins going badly. With that said I think the only version that can physically challenge Sargeras is Worldbreaker Hulk.