Santiago Segura has claimed that the inspiration for this movie was Cobra (1986), that he conceived as a parody of the 80s action movies. In fact, the own title is a spoof of Stallone's movie, since then in Spain Cobra was titled as "Cobra, el brazo fuerte de la ley" (Cobra, the strong arm of the law).
The movie marked the return to the cinema of Tony Leblanc and Espartaco Santoni after more than 20 years. Leblanc retired from the movies in 1975 to dedicate himself to the theatre, but a car accident in 1983 cut short his theatrical career. The last movie Leblanc did before this was Tres suecas para tres Rodríguez (1975), and the last movie Santoni did before this was Pena de muerte (1974).