After nine years of development and delays, directors Robert Rodriguez and Frank Miller presented their long-awaited Sin City sequel, Sin City: A Dame to Kill For, to the Comic-Con crowd. While the follow-up doesn't hit theaters until August 22, the directors are already looking ahead to Sin City 3, that is, if enough fans show up to support Sin City: A Dame to Kill For in theaters.

"Robert and I are already talking about Sin City 3. So you'd better show up for number two or they won't pay for it."

The filmmakers also showed off a portion of the Sin City: A Dame to Kill For opening scene, which is adapted from Frank Miller's Just Another Saturday Night. The sequence involves Marv (Mickey Rourke) slaughtering a group of frat boys after they try burning a homeless man alive. The footage also includes scenes with Nancy Callahan (Jessica Alba) stripping, Marv drinking and a car chase.

The directors then introduced cast members Jessica AlbaJosh Brolin and Rosario Dawson, who revealed she showed up to set with a shaved head.

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"I didn't want people to think I wasn't going to bring it."

Jessica Alba also showed up to set that first day with an intensity that surprised director Frank Miller.

"My first thought when I said hello to Jessica was, 'I haven't seen her in eight years. How did I piss her off?"

Robert Rodriguez added that fans will be surprised at how much Jessica Alba's Nancy changes by the end of the movie.

"When you see what she becomes by the end of this, you'll be pretty blown away."

Frank Miller added another story about how Jessica Alba was able to pose in one particular way that he drew in the comics, but thought it was an "impossible pose" for someone to pull off in real life. The actress responded with, "It's what you drew."

As with all of his movies, Robert Rodriguez is again providing the score for Sin City: A Dame to Kill For, although this time, he used his phone for most of the music.

"80 percent of the score was written on my phone."

Going back to Sin City 3, Frank Miller ended the panel with a powerful declaration.

"I'll be damned if it takes us nine years for the next one!"