Exclusive: Behind the Killer G.I. Joe Ninja Fight

G.I. Joe: Retaliation explodes onto Blu-ray and DVD on Tuesday, and ETonline has an exclusive, behind-the-scenes look at how they pulled off that incredible ninja fight sequence on the sheer rock mountain wall, with a special introduction by Joe stars D.J. Cotrona and Adrianne Palicki!

PICS: Hollywood's Hottest Movie Posters

The behind-the-scenes clip, from a feature available only on the G.I. Joe: Retaliation Target exclusive edition, shows just how director Jon M. Chu transitioned from making dance/music movies such as Justin Bieber: Never Say Never and Step Up 2: The Streets to using his choreography background to enhance the balletic, eye-popping fight sequences in the big-budget effects film.

Starring Dwayne Johnson, Bruce Willis and Channing Tatum, G.I. Joe: Retaliation finds the Joes not only fighting their mortal enemy Cobra, but forced to contend with threats from within the government that jeopardize their very existence. Is the President of the United States real, or an impostor?

Video: ET Exclusive -- 'G.I. Joe 2' Set Visit

Available now on VOD, G.I. Joe: Retaliation also stars Ray Park, Byung-hun Lee, Jonathan Pryce and Ray Stevenson. Get the latest updates on the film on Facebook (www.facebook.com/GIJoe) and Twitter (@GIJoeMovie).