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French success d'estime Luc Besson (La Femme Nikita) follows up his children's fantasy Arthur and the Invisibles (2006) with this high-adrenaline, action-charged crime comedy that he produced and scripted but did not direct. At the heart of the tale is a nitwit Marseilles cop, Police Commissioner Gilbert (Bernard Farcy), prone to making outrageous blunders such as mistaking soccer star Djibril Cisse (in a cameo) for an illegal immigrant, and a hotel chambermaid for a terrorist. The other major member of the force is Emilien (Frederic Diefenthal), a hard-working soul, yet one perhaps too genial to be a cop. He's best friends with taxicab driver Daniel (Samy Naceri), an individual low-key to the point of anemia; their young sons enjoy playing together. As the tale opens, a manically insane, hyperactive Belgian criminal, "La Belge," (Jean-Luc Couchard) undergoes extradition to trial in Africa; en route, he temporarily lands in the Marseilles police department for a few hours and bamboozles Emilien into believing that he's actually a Belgian embassy employee railroaded by the real crook, who is now at large. Emilien foolishly buys the story and sets La Belge free -- prompting an outrageous and explosive series of complications. Meanwhile, Emilien's achingly beautiful wife (sex symbol Emma Sjoberg-Wyklund) has been assigned to infiltrate La Belge's gang on an undercover level -- so far undercover that Emilien himself isn't even aware of her role. Upon release, Taxi 4 shot to the top of the French box office charts to qualify as a local blockbuster, topping numerous American releases in the process.