How Arnold Schwarzenegger Fought Himself In 'Terminator: Genisys' — VIDEO

The bulk of the excitement surrounding this summer's Terminator: Genisys , the fifth in the time-traveling killer robot franchise, was centered around the return of star Arnold Schwarzenegger. Fulfilling his oft-repeated promise that he would be back, Schwarzenegger starred in the movie after sitting out 2009's disappointing Terminator Salvation, and his inclusion immediately excited fans over the prospect of once again seeing the star in his most famous role. But having just one Arnold Schwarzenegger wasn't enough for Terminator: Genisys, and the film found a way to include a younger version of the Austrian Oak, appearing as he did in the original 1984 Terminator . Not only that, but in the movie's best scene, the two Arnolds engage in a knock-down, drag out fight. But how did they do it? How on Earth did Arnold Schwarzenegger fight a younger version of himself in Terminator: Genisys? Thankfully, a new behind the scenes clip from the film's upcoming Blu-Ray release holds the answer.

In the new clip, it's revealed that Schwarzenegger was not sent back in time by Skynet to 1984 to fight a 37-year-old version of himself like I had assumed (hey, it is a Terminator movie). Instead, the film's producers conducted a search for any human being whose body physically resembled the build that Schwarzenegger had 30 years ago. That turned out to be no small feat, since Schwarzenegger was a seven-time Mr. Olympia and was considered in his prime to have one of, if not the, most-impressive physiques of all time. The closest they could find was a bodybuilder named Brett Azar, who was the only man they encountered with Schwarzenegger's 50-inch back, though his other muscles were slightly toned-down compared to the original Terminator's. He stood in with Schwarzenegger in the fight scene, which you can see below.

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Additionally, computer animators then replaced Azar's face with a digital recreation of Schwarzenegger's, and in most scenes replaced his body with a CGI Schwarzenegger body as well. The production on the scene took a year, but it definitely pays off. The fight scene is indescribably awesome, as is Schwarzenegger's commitment to it since he was 67 years old at the time of filming and clearly still knows how to fight and take a punch, as evidenced by the clip.

The new clip is part of over an hour of bonus features included in the Terminator: Genisys Blu-Ray and Blu-Ray 3D Combo Packs, which are set to be released on Nov. 10, alongside the DVD and On Demand releases of the film. If you want to watch young and old Arnold go at it sooner, the film will be available in Digital HD on Oct. 20, but in the meantime, this clip should be more than enough to tide you over.

Images: Paramount Pictures