The Teen Titans get in the mail a video game starring them. When they try to play it, they’re transported into the game’s world. They then travel through the levels trying to find a way home.
After defeating Jinx, Gizmo, Mammoth, Mumbo, Plasmus, a bunny, Overload, Cinderblock, and Ternion, Slade reveals himself making Robin think he was the one who sent the video game to them.
However after defeating Slade, the Titans find out he is a program like everyone else. The Master of Game then is shown to be behind the bosses, they fight and capture him, and find that he didn’t trap them in the video game world and that the player is the “villain”