Four Musketurtles

At the local Mardi Gras parade, April, dressed as a 17th century noblewoman "right out of the Three Musketeers", suggests that the Turtles, who are walking the street "au natural", should be in costume and should also read Dumas' book. She just happens to have a copy on her and gives it to Leonardo, who reads it at the first opportunity, is enthralled by it and tries to convince the other Turtles of the striking similarities between themselves and the Three Musketeers. Meanwhile, down in the Technodrome, while watching April O'Neil's coverage of the Mardi Gras parade, Krang learns that the priceless Star of Brazil diamond, is, in fact, the long lost element of Impervium - a substance found only in Dimension X and was "sent" to earth as part of an experiment. Krang tells Shredder that with the Impervium once again in his possession he could create weapons unknown to the likes of man. Shredder wastes no time sending Rocksteady and Bebop up to the Earth's surface to steal the gem.

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S03E17 - Turtles, Turtles Everywhere