Titans, Vol. 1 #25A

Who is Troia?, This Is Your Life
Both sets of Titans travel to Dark Angel's netherworld, but she has seen them coming. As the "flip side" of Donna Troy, the evil spirit can sense her coming. Dark Angel summons various copies of herself and disperses them through time to various Titans eras to kill Donna Troy everywhen! The Titans, all of them, aren't going to let that happen - they defeat the various copies of Dark Angel and return them to the Netherworld. Unfortunately, these copies merge there, making the villain stronger! It's a tough fight and the Titans a losing, until Troia reclaims her place in reality decisively, dispatching Dark Angel for the last time (?)
Release Date: 2001