I've been kicking around some Super-Villan Team Up ideas just to amuse myself, and one of those involved a lesser-used mystic villain (someone like the Left Hand or Tai from New Warriors) rescuing some villains from various hells. These villains discover their abilities have been altered somewhat (and increased in all cases) by their time in hell. Characters like Melter find that their power has been made a part of them.
However, what they discover through trial and error, is that every time they use their hell-born power, it's like a beacon announcing their whereabouts to the hell-lord whose domain they escaped from.
I had thought about using Melter and Catseye, but hadn't gone much further than that.
Sorry. As soon as I hit send, I realized I hadn't finished my thought.
Anyway, the ressurected villains end up having to stay together until they can figure out how to get by with decomposing bodies and powers they can't use. Maybe eventually they'd replace their old tech, take over new bodies, etc...but they'd have to rely on each other, and become a team.
It'd be a recurring thread throughout an ongoing Super-Villain Team Up book.