The T.C.R.I. building is seen briefly in the fourth episode. It is mentioned as the former workplace of Baxter Stockman in the fifth episode. In "TCRI", the Turtles discover that T.C.R.I. is the Kraang's main headquarters on Earth, and April O'Neil finds blueprints of the main building in Brooklyn. The bottom two thirds of it are ordinary offices where normal humans work, but the top third appears blank on the blueprints. The Turtles determine that this must be where the Kraang are hiding the portal to Dimension X and resolve to shut it down. With the help of April and Leatherhead, the Turtles break into the building but are captured by the Kraang. By the time they free themselves, the Kraang have already activated the portal and the monstrous Rock Solider Traag comes through. The Turtles