One day Doomsday(yes, Doomsday...) comes looking for you. Why?
Apparently he's hit a dead end with prize fighting in the Khazan thanks to a certain angry demigod, who he just can't for the life of him beat with brute force(he keeps getting punched into oblivion.) And the first words he says?
"Need to learn...how to fight!"
Apparently DC pays him quite a bit for the use of his image, so you'll be paid about 1.5X what you're making now. So you've no incentive to say "no."
SO! How will you train Doomsday?