Emilien (Played by Frédéric Diefenthal) is a disgraced police officer demoted to desk duty for wrecking too many police cars and nobody wants to work with him as a partner. He confuses Daniel as the prime suspect in a robbery. Daniel agrees to drive Emilien around in his race car turned taxi cab for free as a police car substitute until the robbery is solved. Daniel ends up becoming the civilian consultant to the police and the unofficial civilian consultant police investigation partner to Emilien (The only time in the film/television series that two members of the same gender worked together). From this point onwards, being driven around in a taxi cab instead of driving a police department assigned vehicle ends up becoming a trademark for Emilien.
Emilien's ex-girlfriend police Sergeant Petra (Played by Emma Wiklund aka Emma Sjöberg) is also his employer in the police station. She's constantly getting in the way and always on the verge of falling back in love with Emilien.
Luc Besson wrote and produced all four instalments of the French language film series Taxi. The four film series was so popular, that a remake was filmed with a severely different cast of characters and much more of a heterosexual approach.