Hulk VS Superman twist
This isn't the real hulk it's the Cosmic Hulk robot. It is somehow sucked into an experimental portal and pops out on the other end in the middle of a LexCorp lab. Lex gives it a looking at and in time gets it to recognize him as it's master. lex has a month prep time to prepare the cosmic hulk bot to fight superman.
Surprise attack in the middle of metropolis.
Who wins and how?