“The Wild Wild West” has the weak, weak script. It is not unusual to see a trailer that is better than the movie, but in this case the music video is brighter, wittier, and more exciting than the movie.

Will Smith may still own the 4th of July, but this year’s entry is much weaker than his 1996-97 one-two punch of “Independence Day” and “Men in Black.” His unquenchable appeal goes a long way toward making up for poor plotting and dialogue, but not far enough, leaving us with a summer popcorn movie — impossible to resist at the time, but leaving you a bit queasy afterward.

The 1960s television show starred Robert Conrad in a bolero jacket and very tight pants as a Civil War era secret agent. Like the newly popular James Bond, West was a spy who was infinitely attractive with the ladies and who always triumphed over the bad guys, who were always maniacs intent on three things — total world domination, killing West in fiendishly complex contraptions, and making sure that they conveniently explained all their plans to West in time for him to escape from the fiendishly complex contraptions and save the world again. West’s sidekick Artemus Gordon was a master of disguise and technology. Their most frequent foe was Dr. Loveless, played in the series by Michael Dunn. And the whole thing was very much tongue in cheek.

The big-screen version has Will Smith as West, all bolero jacket, tight pants, and attitude, with Kevin Kline as Gordon, Kenneth Branagh as Dr. Loveless, and Salma Hayek as the lovely Rita Escobar, who flirts with all three men and spends much of the movie in fetching 19th century lingerie with a brief detour into a union suit with the trap door open. The plot remains the same — Dr. Loveless, vowing revenge for losing his entire lower half in the Civil War, seeks total world domination, and West and Gordon have a week to stop him. There is some attempt to deal with the fact that West is a black man at a time when most black people had only recently been freed from slavery, but the fact is that the entire movie is so completely preposterous that the effort is awkward and inconsistent with the tone of the rest of the film.

Indeed, the overall tone of the film is awkward, not giving Kline or Hayak much to do, though Kline has a nice turn as President Grant and Hayak looks fetching in her undies. Branagh is happily over the top as the bad guy, there are some cool special effects, and Smith’s charm and grace carry it a long way, but not far enough to make it anything more than a pleasant diversion less raunchy than “Austin Powers.” Parents should know that there are some PG-13 sexual references, including prostitutes and Loveless’ impotence and a lot of cartoon-style action- violence.