Tara Markov, the first person to use the name Terra, is a supervillain with the power of geokinesis. She is the illegitimate daughter of a promiscuous Eastern-European king and was covertly sent off to the United States to prevent a scandal. Sometime before that, Terra would receive dodgy medical treatment from the royal scientist Helga Jace that would grant Terra her superpowers, but also afflict her with a disposition toward being crazy and evil.
Having decided that she has a hankering for ruling over the weak and helpless rather than protecting them, Terra would make a steady living as a professional hitwoman. Her most notable client would come to be Deathstroke, with whom she struck up a romantic relationship with. For a time, she would operate as a spy for Deathstroke by joining the Teen Titans and secretly relaying vital information about them during the course of her "kinship" with the team.
Terra's treachery would inevitably result in the Titans' capture at Deathstroke's hands. However, some subsequent betrayal of Deathstroke's loyalty to Terra (whether it be through his son's body possession powers staging a display of heroism or a deliberate act of backstabbing on Deathstroke's part) would serve to drive Terra over the edge and compel her to collapse the immediate surroundings in a bid to wipe out every living being within the general vicinity. Needless to say, this would result in Terra's untimely death. Terra's reanimated cadaver would later go on to enlist in the Black Lantern Corps.