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Teenage Mutant Ninja Turtles (2003) Official Model Sheets and Concept Art Masterpost

The Turtles and Splinter

Leonardo (Animal Transformations) | Raphael | Donatello | Michelangelo | Splinter | Turtle Tots (Cancelled Season)

Weapons | Turtle Vehicles | Gadgets, Gizmos, and Other Odds and Ends

Fast Forward Gear

Layout of the Second Lair | Bedroom Illustrations

Allies

Casey and April | Angel, The Professor, Mortu, Quarry (Sydney), and Nano | Honeycutt/Fugitoid, Leatherhead, and Klunk | The Daimyo, Gyoji, Ultimate Ninja/Ue-Sama, Usagi, Lord Simultaneous, and Renet

Antagonists

The Shredder (Utrom/Ch'rell and Tengu) | Baxter Stockman | Oroku Karai | Hun | Chaplin, Khan, and the Foot Ninjas | Harry, Garbageman, the High Mage, Abigail Finn, Parker, the Mob Boss, and Weasel

Miscellaneous

New York Outdoor Backgrounds | The Peter Laird Files (rough designs, art tweaks, and accompanying comments)