You have successfully possessed the Martian Man...

You look down and see a spandex-clad green body beneath you. Though it looks solid, every inch of you felt as if it were liquid and took effort to be held in shape. You knew intuitively that you could control that in order to shift into anything you wanted with enough concentration. You could also distantly hear the thoughts of everyone on the satelite! It took everything you had to filter them out, but it was causing a tremendous headache. Is this what the Martian Manhunter dealt with every second? You put your hand to your head and groaned in pain as memories filled your head, including muscle memory. Suddenly, things filtered themselves out and you could breathe again. You now didnt have to exert any effort to focus and knew intuitively how all your powers worked, right on time for Supergirl to wake up.

"J'onn? What was I just doing?" she asked, clearly unable to remember anything since your possession.

You immediately did your best to get into character. "You were responding to a crime alert. Lex Luthor and Brainiac have attacked Metropolis. Superman is already on the scene, but he can use your help."

"Right, of course! I'm on my way!" she said, flying to the teleporter.

As you looked around the watchtower, you realized just how much power you now had. J'onn J'onzz could not only shapeshift into anyone he wanted, but also had powerful mind control and memory manipulation abilities that he swore to never use on either heroes or villans. Of course, you were bound to none of those commitments. What to do?