Must be either the Teen Titans 2003 cartoon or people believe she could be still be redeemed, I remember a blog which talked about Terra and the JC, it seems like he/she didn't like the arc and write a lot of notes of how she was being mistreated but Wolfman did say that she was created to be an evil Kitty Pride.
I know who Geo Force is but he has nothing to do with the Titans' history other than being Tara's brother. What do you mean the ''same thing''? The one where Terra and Deathstroke supposedly had sex or something else? To me, back then comics were a bit darker with the JC arc, since were in the new continuity the JC could still happened but probably without the statutory rape just a betrayal.