Kellan Lutz shares throwback photo of 'The Expendables 3' set

SAN DIEGO, July 25 (UPI) -- Kellan Lutz took to Twitter Thursday to invite fans to stop by The Expendables 3 booth at Comic-Con in San Diego this weekend.

The actor's invitation came in the form of a caption on a throwback picture from the first day on the set of the action thriller.

Lutz stars as John Smilee, a former Navy SEAL recruited to help Barney track down Conrad Stonebanks, in the upcoming flick.

The third installment of The Expendables franchise finds the team in a conflict with Stonebanks, an arms dealer and The Expendables' co-founder, who is determined to destroy them.

Starring Sylvester Stallone, Jason Statham and Jet Li, The Expendables 3 hits theaters on August 15. This year's Comic-Con convention will be held at the Hard Rock Hotel in San Diego, Calif. from July 24 through the 27.