Fan Casting Teen Titans

A group of superpowered teenagers (plus Dick Grayson) have been forced to team up because they're all being hunted down by a dangerous mercenary, Slade Wilson. After taking him down, they learn he was hired by Brother Blood, a Trigon-cultist. The Titans track down Brother Blood and they all get defeated very quickly. So, they each get a new recruit to join the team and they go to fight him. After an intense battle, Blood summons avatars of the Seven Deadly Sins to awaken Trigon and succeeds. So, the twelve Titans go to face Trigon and are able to seal him away before his power on Earth grew too strong.