What if... Hulk was DC and it was the JLA inner Circle who banished the Hulk, so he came back in WWH to take revenge on them, he attacks the Watch Tower... OH, I almost forgot, he has gotten a Red Lantern Ring somehow... (Use your imagination)
The JLA team consists of:
Green Lantern (Hal)
Flash takes Namor's Place and did not want to banish Hulk, so he is absent.
Who wins and why, apologies if It has been done, but I could not find it. I do not know that much about Lantern rings, but I know Red is powered by anger, and WWH is pretty damn angry.