Have him go undercover as a JLA member

"Per my analysis, you will be most useful as a pawn. You will infiltrate the Justice League and assist me in crippling them from the inside."

Three monitors appeared before him.

"As a gesture of good will, I will allow you to choose which form I will mold your body into."

The various screens showed numerous female members of the Justice League.

"What makes you think I would betray the Justice League?"

"You are not one of them. You are viewed as inferior. And you are interested in your own self-preservation. As I stated previously, it is in your best interest to rule this universe by my side. Your mind will be of far greater use to me in tact. Capable of free thought. Now choose."