Robin is sent by Batman to work with the Teen Titans after his volatile behavior botches up a Justice League mission. The Titans must then step up to face Trigon after he possesses the League and threatens to conquer the world.
Better than this year's other Damien Wayne film, _Bad Blood_, but certainly not what I'd call "good" either. The violence is initially somewhat cathartic, in a _Dragonball Z_ kind of way, but that wears thin quickly and the incredibly unusual decision making takes hold. There are a handful of concepts explored in Justice League VS Teen Titans that felt like they could have been quite interesting if they were dealt with in a longer, more personal format, like a television show. Instead because we're pressed for time in this animated feature, we have to montage through all that in some truly bizarre ways.
The "versing" is also, unsurprisingly, pretty bull.