The season premiere continues the apocalyptic events of last season as Trigon sets out to win the Titans over to his side by embracing their inner darkness.

While Dick trains the next generation of Titans, Donna and Kory track down a rogue metahuman. But an old threat drives the Titans – old and new – back together.

The old Titans reluctantly return to Titans Tower to strategize against an old enemy. But the secrets of the Titans’ past threaten to tear apart this newly formed team from within.

Four years ago, Dick, Donna, Hank & Dawn formed the Titans with Garth aka Aqualad. But the team is tested with the arrival of a new villain.

With the team in upheaval, the Titans do everything in their power to save Jason’s life. But when Deathstroke demands they turn over Rose, the dilemma threatens to tear the team apart.

Conner Kent and Krypto escape from Cadmus Labs. His search for the truth about his past leads him to Lionel Luthor and genetic scientist Dr. Eve Watson.

The Titans reach a potential breaking point after their most recent encounter with Deathstroke. Dick is haunted by a familiar voice.

The team befriends Jericho Wilson, Deathstroke's son. Dick finally reveals the truth to the team.

In the aftermath of Dick's confession, the heroes all go their separate ways. Kory is surprised to hear unsettling news from her home planet.

Gar finds himself caught in the crossfire. Dick's hero side has not been buried forever. Rachel meets a runaway girl.

With Dick still in prison and Gar under the microscope at Cadmus, the remaining Titans are called together to save their teammates.

Finding himself at a new low, Hank is cage-fighting for money to support his unhealthy habits. But when he wakes to find his Hawk suit gone – and an imposter acting in his stead – he realizes how far he's fallen... & it's time to make a decision. Meanwhile, Donna and Dawn confront a Cadmus operative to gain information about Gar and Conner, as Cadmus initiates its Phase One plan, tapping into Gar's lethal abilities. Back in Gotham, Rose is overcome with guilt and reveals her secret to Jason. When Dick realizes that Jericho might have somehow survived his death at his father's hands, he escapes from jail in the hopes to rescue him. But first he'll need a new suit to replace the Robin suit he destroyed.

The Titans reassemble under Dick, who has now fully taken on the mantle of Nightwing, to fight Deathstroke and attempt to save Jericho. But that’s not the only struggle they face – as the team finds themselves up against mind-altered versions of Gar and Conner, who are now supercharged weapons at the “mercy” of Mercy Graves and her Cadmus final Phase Two plan.