Mortastic Four
Trigon is the father of Raven of the Teen Titans and an otherworldly demon with plans of interdimensional conquest. So, yeah, usual stuff. He fought the Titans early in their series, and the good guys just barely eeked a victory. He returns later in their run with one of my favorite story arcs of all time, which of course I would be happy to let you borrow. For the last twenty or so years, however, he has only appeared as a reanimated bag of bones and in a couple of episodes of the epilepsy-inducing Teen Titans Cartoon. How can a good character stay dead for so long?
Okay, I've got a special four for one. Who are these Bat Enemies?