New York: Part 1 | [s1e21] Return To

After initially being overwhelmed by the invisible attackers, the Turtles adapt. They use fire extinguishers to coat the area in dust, revealing the ninjas' silhouettes, and Donatello uses electro-magnetic shurikens to short-circuit their cloaking devices. Key Reveal & Cliffhanger

April O'Neil acts as "Mission Control" from the lair, using her knowledge of Baxter Stockman's systems to infect the Foot’s communication network with a computer virus, effectively blinding their tactical coordination. [S1E21] Return to New York: Part 1

Using the Battle Shell as a remote-controlled decoy to draw Foot Clan forces to the lower levels, the Turtles sneak into the building through the sewage system. Using the Battle Shell as a remote-controlled decoy

The Turtles begin a systematic ascent of the skyscraper. They face an army of Foot Ninja and the formidable Foot Tech Ninjas , who use advanced cloaking technology to remain invisible. The group arrives at their old lair to

The group arrives at their old lair to find it deserted, realizing the Shredder believes they are dead—an advantage Splinter insists they use to launch a surprise attack.