Marv Wolfman and George Perez's NEW TEEN TITANS: THE JUDAS CONTRACT is one of the seminal stories in comics history. Not just a four-part tale, the story served as an endcap to a long-running plot, revealing that one of the Teen Titans had actually been operating undercover as a spy for Deathstroke, the Terminator.
While this story couldn't be captured accurately in the DC Animated Universe, writer Ernie Altbacker and director Sam Liu came as darn close as they could to the feel of that story and its touchstones, while also staying true to the established DCAU continuity.
The film opens with a vignette of the original Teen Titans: Robin (the Dick Grayson incarnation), Speedy and Kid Flash, with Beast Boy and Bumblebee taking the places of Aqualad and Wonder Girl. The scene details their first encounter with Starfire as they find her in battle with aliens. It's also the first kiss between Robin and Starfire, since Tamaranians absorb language through kissing.