Geo Force is a character and superhero appearing exclusively in the Teen Titans Go! comic series (#51 Metamorphosis). He is also a member of the Outsiders.
After he had come in contact with the Titans, Beast Boy brought him to the school where he met the schoolgirl who looked like Terra. Geo-Force was certain that the schoolgirl was, in fact, his sister Terra, but he remarked that she looked happy now, something he had never seen in Markovia. Deciding not to confront her, he left her to grow up happy in Jump City and headed back to Markovia alone. When flying off with Beast Boy, Terra appears to have caught a glimpse of her brother, but didn't think much of it afterwards and continued talking to her friends.
- In the DC Comics, Geo-Force and Terra received their earth control powers through a science experiment. When Markovia was invaded by a villain called Baron Bedlam, Geo-Force became a founding member of Batman's new team, the Outsiders, after Batman had quit the Justice League because they wouldn't interfere in the conflict for political reasons.