Many years after the death of Terra another girl with the same appearance and powers appeared as a member of the Team Titans, claiming to be from the future.
I'm Not from This Age: Future origin
The future origin of Terra starts 10 years into the future. In this timeline the villain known as Lord Chaos reigns the world with tyranny. Battalion is the second in command of a team named "Team Titans". These Titans were created to defeat Lord Chaos and restore the peace and freedom of the world. This timeline was proven false.
As an attempt to stop the resistance and the Team Titans from being a problem for him anymore Lord Chaos decided that he would need a spy between their ranks to know of the moves and plans of the opposition. It was because of this plan that Lord Chaos sent some of his men to one of the rebel hospitals and took a girl that had a little similitude in appearance to Terra. The scientists of Lord Chaos were able to extract the DNA from the bones of the long dead Terra and inject it to the kidnapped girl. Because of this experiment the girl obtained the same powers that the first Terra had, while also adding false memories to her brain making her believe that she was the daughter of Geo-Force and making a surgery to make her look identical to the original Terra.
Just like Lord Chaos had thought, and thanks to the lack of records from the betrayal of Terra, she was able to join the resistance and the Team Titans as a brainwashed double agent, working for Lord Chaos in the same way that her predecessor had done with Deathstroke in the past. However the only difference was that before Terra could give the information to Lord Chaos about their location she was discovered by the leader of the Team Titans.
After the discovery of Terra's betrayal the Team Titans used a cerebro mind probe to learn everything they could about her. After learning everything that Lord Chaos had done to Terra as an attempt to use her as a weapon against the resistance and the Team Titans they also discovered that the body of the new Terra was rejecting the DNA of the original one and that it would cause her to die in just a few weeks. Prestor Jon was able to make the body of Terra accept the DNA of her predecessor and saving her life in the progress. After learning that everything she believed in was false and how much Lord Chaos had done to her, she decided to join the Team Titans to help them fight Lord Chaos.
Back to the Past
One day the leader of the Team Titans decided to make one risky and dangerous mission. The team titans would travel 10 years into the past to kill Donna Troy in an attempt to stop Lord Chaos from being born. Of course this had to be made before Donna Troy was able to give birth to her son (The future Lord Chaos). The first part of the mission was successful and the team of the future (Team Titans) were able to go back to the past before Donna Troy gave birth to Robert Long. When the Team Titans tried to kill Donna Troy they encountered the team of Titans from the present (the New Teen Titans) and fought them. However before the Team Titans could kill Donna Troy she gave birth to her son. Although the mission looked to have failed, the Teen Titans and the Team Titans were able to both stop the future Lord Chaos and did not have to kill Donna Troy.
We did it...now what?
After the mission was accomplished the Team Titans were trapped in the past, with no way to return home. Without any options they decided that they would stay on that era until they could find a way to go back. In an ironic twist they accepted the offer of Donna Troy to live in her farmhouse in the city of New Jersey. After that they decided to investigate this timeline to find where they belonged in it.
Terra started to develop a crush on Changeling, while at the same time she met Geo-Force, who wanted to know if this Terra was really his sister who had somehow come back to life. After investigating Geo-Force decided that this Terra wasn't really his dead sister as evidence suggested, however he threatened her like she was his real sister without caring for the truth, telling her that she was a better person than his dead sister ever was.
In this time crisis was revealed that the real leader of the Team Titans was the being known as Monarch (Previously known as Hawk). The Team Titans were actually from a false future created by Monarch who wanted to have sleeper agents that would serve him as assassins in order to help him to rule the entire timeline. That future also had another purpose. It would help Monarch to train young metahumans and have a bigger and more powerful army against the heroes of all generations. Monarch (Now as Extant) absorbed the power of Waverider and used it to take advantage of the incoming time crisis. Using the army that he created, along with the Team Titans, he attacked the world's heroes who wanted to stop the time crisis. However Extant's plan was unsuccessful and the Team Titans were defeated by the earth's heroes. At the same moment, time started to collapse, this made all the parallel and false timelines to be erased from existence. As another result the Team Titans were erased from history and disappeared. The only three Team Titans members that weren't eased were Terra II, Mirage, and Deathwing because it was revealed that they were from the present timeline and that Extant had taken them from there, erasing their memories to make them part of his army.
Terra II or original Terra?
After the events of Zero Hour Terra joined Arsenal's short lived Titans team along with Mirage, Supergirl, Bart Allen, Minion, Donna Troy and Kyle Rayner. After the team disbanded she moved to Markovia where she decided to let the scientists of the country run a few tests to clear all questions if this Terra was indeed the same girl that had betrayed the New Teen Titans.
Terra awaited the results with a great fear that she may really be the same person, however the only person that received the results was Geo-Force who told Terra that the results were negative and that she indeed wasn't Geo-Force's dead sister back from the grave. However it was revealed that the results were positive, meaning that the Terra that betrayed the New Teen Titans and the one from the Team Titans were indeed the same person, Geo-Force is the only person that knows that the two Terras are indeed the same person.
Death of a Hero
After the events of Infinite Crisis the DCU skipped one year of continuity. During the missing year the Teen Titans had over a dozen different lineups. Terra was one of the Teen Titans during the missing year, and also a member when Black Adam declared war to the world, confronting the heroes of the entire world. During the fight against Black Adam both Terra and Young Frankenstein were killed in action by the angered Black Adam.