If you just can't get enough of the action stars of the 1980s, then chances are you are eagerly awaiting the opening of, a prison-set action flick that co-stars Sylvester Stallone and Arnold Schwarzenegger. This high-octane thriller has Stallone playing Ray Breslin, an expert in structural security who has built the titular prison to be escape-proof. However, his specialized skills are put to the test when he is framed and jailed in this literal prison of his own making. As he explores the whys of his situation, Breslin also seeks a way out and so creates an unwieldy alliance with Schwarzenegger's master criminal, Church, who helps him on the condition that they bust out together. Jim Caviezel () co-stars as a surely stern warden; Sam Neill, Vinnie Jones, and Amy Ryan also make appearances.is now in production and ET got a look behind the scenes as well as a chance to talk with the stars, who give some new insight to their characters and breakdown how Stallone and Schwarzenegger went from box office rivals to recurring collaborators. Check it out below:In his own way, Stallone is looking to move action features away from the superhero genre, bringing it back to a place where an ordinary—or at least not super-powered—man is put in an extraordinary situation and must become a hero, or as Stallone calls it, "basic male-pattern badness." It's an intriguing concept, but there's something unsettling about seeing a grey-haired Terminator playing a muscle-bound hacker. It's partially that I'm having flashbacks to Schwarzenegger's miscasting in, and partially that I wonder if these "old war horses" still have what it takes to shoulder an over-the-top action feature without the ensemble support of younger and fitter stars.We'll find out next year, asis expected to hit theaters in 2013. In the meantime, the pair will share the screen in, which opens August 17th.