Yes

The next thing you knew, the Martian Manhunter had shapeshifted into a giant snake and was holding you in place tightly. You struggled, but even Supergirl's super strength was not enough to get you out. You heard a voice in your head. Who are you, and why have you taken Supergirl's body?

You continued struggling to no avail. My name is Mark. I don't know how I got here. I just want to be a hero...

Heroes do not take possession of a body that does not belong to you. Especially with the dark intentions in your subconscious. Release Supergirl... Then we can talk about yout future as a hero.

You kept struggling, but realized it would get you nowhere. Suddenly you felt a throbbing on your finger, where the ring was. Another voice entered your head, this one sounding like your own, but more... confident. Staying in Supergirl will not do any good. But this ring gives you a power no mental defenses can beat. Even a martian.

You grinned as you realized that Martian Manhunter had enough mental skill to beat a typical ghost or telepath, the magics of this ring gave you an advantage he wouldn't be prepared for. And he did't seem to have heard that voice, either. Please loosen your grip. I'll leave Supergirl so we can talk, you think as you demonstrate willingness by stopping your struggle. The Martian-snake narrowed his eyes and released you before turning back to his hero-form. You quickly will yourself out of Supergirl, who sighs as she falls to the floor ****. Wasting no time, you quickly fly straight into the Martian Manhunter.

As your vision returns you find that..