While watching video tapes of old battles, Raphael sees a mystery person spying on them. While the Turtles investigate, an alien warlord named Dregg sends his TechnoGansters to steal all the gold on Earth. The Turtles find them attacking the Federal Reserve Building and are outmatched, until the mystery person arrives. But he proves to be a handicap and the TechnoGansters escape. Back at the Lair, Donatello surprisingly announces that the mutagen is unstable and will cause unknown effects on them. They then find the mystery person in the sewers and he reveals himself to be Carter and in search of Splinter, who agrees to make Carter a student. Meanwhile at the Copcor Building, April sees the unveiling of the new robotic law enforcement: the Intimidators. But Dregg has them causing trouble and the Turtles race to the scene. Carter decides to go help, unknowingly spilling mutagen on himself. Dregg himself and the TechnoGansters join in the fight too, but they find it hard to beat the dete
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