Eh, this is more a comic book thing than a comic book movie thing, but it just didn't seem like something that needed its own separate thread.
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Anyway, there were already two iterations of the Teen Titans, they flopped both times, and DC gave up on them. So why give it a third try?
Because Marv Wolfman, the former editor in chief of Marvel quit Marvel in a huff because of some utterly insane office politics that were going on in the 70s. Marvel went through a large number of editors in chief over a 4 year period, which finally resulted in an editor in chief who was able to keep the job for a long time, but was someone who pissed off the writers and artists, many of whom fled to DC, including Wolfman.
Before leaving Marvel, Wolfman was writing an odd comic book title that paired the Thing from Fantastic Four with a different hero every month. When Wolfman got to DC, he was sick of doing team-up stories, so of course DC immediately put him on a Batman team-up comic, and after that a Superman team-up comic.
Wolfman was sick to death of writing team-up stories in which someone else was picking which two characters would be in any given issue, so he wrote his own team-story involving a whole team: the New Teen Titans.
Most of the incarnations of the Teen Titans you see today in TV cartoons, direct-to-video animated movies, or the new live action show on DC Unlimited are based on Wolfman and Perez's version of the teen team.