There was a movie or episode of Teen Titans where they were all grown up except for Robin. The tower was destroyed, and it's been bothering me for days. Does anyone know what it was called or have any other info?

All I know about it is that Robin is still young and he's looking for the other Titans and finds them all adults. BB works for the circus, Cyborg is holed up in the destroyed tower...and that's about all I know, other than Robin sees himself grown as some other kind of hero/villain. If you know the title of the episode or movie that it is, please inform me. This has been eating at me for days!