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See Dwayne 'The Rock' Johnson on Day One of Shooting for G.I. Joe 2: Retaliation

It's hard to believe that G.I. Joe 2: Retaliation has become a legitimate summer tentpole from the time of its announcement to its first day of shooting, but that's sorta what happened. Lots of that has to do with J.J. Abrams's inability to get the ball rolling on Star Trek 2 in time for Paramount's planned June 29, 2012 release date -- resulting in Joe landing there -- but with a cast featuring Dwayne 'The Rock' Johnson, Channing Tatum, Adrianne Palicki and possibly Bruce Willis, it has become hard to ignore G.I. Joe 2's potential for box office breakout next summer. Step one on that road is filming, which direct Jon M. Chu has commenced, and Johnson has commemorated on Twitter. Click through for a look.

"1st day of shooting. 110 degrees. Bring It," wrote Johnson on Twitter. The Rock stars as Roadblock in Retaliation, a name that could be literally judging from his biceps and general physique.

G.I. Joe 2 arrives in theaters next summer.

[via @TheRock]