Irredeemable TP

The Plutonian was the mightiest hero on Earth. Alongside the planet's other heroes he worked to keep the world safe. But something has happened. The Plutonian has gone on a murderous rampage, killing his partner Samsara as well as others. The heroes who were once his allies gather to try to unravel his mysteries. They need to learn what his name is, where he came from, and how his powers work. And they need to do it quickly, because he's hunting them.