Teen Titans, Vol. 3 #18 (2004)

Titans Tomorrow, Part Two: Tales of The Titans
Having discovered that the Titans - their future selves - have essentially become super villains, the Teen Titans seek to escape and almost succeed. The Titans capture Robin when Raven and Dark Raven battle inconclusively. The Teen Titans reach the Flash Museum, where they seek the cosmic treadmill. Robin wakes up in the Batcave, where his older self explains how Duella Dent, Daughter of the Joker, went insane when her father rejected her and murdered a lot of people, including Bruce Wayne and Alfred Pennyworth. That event changed Tim Drake, who took on Batman's mantle, but in a more lethal way. Over the years, he murdered many of Batman's Rogues Gallery. Perhaps worse, he darkened the rest of the Titans. They assumed the mantles of their mentors, repainting them from a darker palette. Outside the Flash Museum, the Teen Titans encounter Titans East - Cyborg 2.0, Terra, Captain Marvel Jr., Flamebird, Ravager and Bumblebee. These claim to be the good guys, but are they?
Release Date: 2004