Paramount's Teenage Mutant Ninja Turtles is an enormous box office hit, taking in nearly $320 million worldwide from a $125 million budget. Before you go and see these heroes in a half-shell in theaters again, we have a new behind-the-scenes featurette that shows how the four mutant brothers were brought to life.

ILM visual effects supervisor Pablo Helman explains that the four actors who portrayed the turtles, Alan Ritchson, Noel Fisher, Pete Ploszek and Jeremy Howard would work together on set in motion-capture suits, with the animators creating the turtles' look based on those performances. We also learn that one of the film's most humorous moments, where Leo, Mikey, Donnie and Raph are beatboxing in an elevator, was never part of the script, and suggested by Pablo Helman after noticing the actors "goofing off" between takes. Learn more about what it took to bring the Teenage Mutant Ninja Turtles to the silver screen in this new video.

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The city needs heroes. Darkness has settled over New York City as Shredder and his evil Foot Clan have an iron grip on everything from the police to the politicians. The future is grim until four unlikely outcast brothers rise from the sewers and discover their destiny as Teenage Mutant Ninja Turtles. The Turtles must work with fearless reporter April and her wise-cracking cameraman Vern Fenwick to save the city and unravel Shredder's diabolical plan.

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