In this summer's "Teenage Mutant Ninja Turtles: Out of the Shadows," beloved old-school TMNT antagonists Bebop and Rocksteady finally made their live-action debut, as played by Gary Anthony Williams and WWE pro wrestler Sheamus, respectively. It was the culmination of nearly 30 years of anticipation for TMNT fans -- remember having to settle for Tokka and Rahzar in "Secret of the Oooze"?

"Out of the Shadows" is now out on home release, and CBR has the first look at a behind-the-scenes extra from the Blu-ray. In the clip, ILM Associate Animation Supervisor Shawn Kelly, ILM Animation Supervisor Kevin Martel and the film's visual effects supervisor, Pablo Helman, discuss the challenge of digitally transforming humans into a mutant warthog and rhinoceros.

"It can't just be digital makeup right on top of the actor's body, he has to be completely replaced," Kelly said.

This clip is from the Target-exclusive version of the film, which is out now and includes Turtle shell packaging and a bonus Blu-ray disc of extras.

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