Don: Say the first letter in each word. Mikey: What? T.C.R.I.? Sorry, it's not ringing any [realizing] bells.
Fun with Acronyms: Now here's an odd wrinkle: TCRI. Techno Cosmic Research Institute. The same initials as on the ooze that created the Turtles, cluing them in that whatever else is going on TCRI are responsible for their mutation.
Lured into a Trap: The Turtles lure one of the Guardians to the Shredder's old base by reactivating the Foot signal and planting a decoy Shredder doll.
The Smart Guy: Donatello is the only one of the Turtles to grasp the importance of the name "Techno Cosmic Research Institute."
Tracking Device: The Turtles use one to follow the Guardian and find the T.C.R.I building