sequence with American basketball star Kareem Abdul-Jabbar, a former student. Production stopped in November 1972 when Warner Brothers offered Lee the opportunity to star in Enter the Dragon, the first film to be produced jointly by Concord, Golden Harvest, and Warner Bros. Filming began in Hong Kong in February 1973 and was completed in April 1973. One month into the filming, another production company, Starseas Motion Pictures, promoted Bruce Lee as a leading actor in Fist of Unicorn, although he had merely agreed to choreograph the fight sequences in the film as a favour to his long-time friend Unicorn Chan. Lee planned to sue the production company, but retained his friendship with Chan. However, only a few months after the completion of Enter the Dragon, and six days before its July 26, 1973, release, Lee died. Enter the Dragon went on to become one of the year's highest-grossing films and cemented Lee as a martial arts legend. It was made for US$850,000 in 1973, the equivalent to $4 million adjusted for inflation as of 2007. Enter the Dragon is estimated to have grossed over worldwide, the equivalent of over adjusted for inflation . The film sparked a brief fad in martial arts, epitomised in songs such as "Kung Fu Fighting" and some TV shows. 1978–present: Posthumous work Robert Clouse, the director of Enter the Dragon, together with Golden Harvest, revived Lee's unfinished film Game of Death. Lee had shot over 100 minutes of footage, including out-takes, for Game of Death before shooting was stopped to allow him to work on Enter the Dragon. In addition to Abdul-Jabbar, George Lazenby, Hapkido master Ji Han-Jae, and another of Lee's students, Dan Inosanto, appeared in the film, which culminated in Lee's character, Hai Tien, clad in the now-famous yellow track suit taking on a series of different challengers on each floor as they make their way through a five-level pagoda. In a controversial move, Robert Clouse finished the film using a look-alike and archive footage of Lee from his other films with a new storyline and cast, which was released in 1978. However, the cobbled-together film contained only fifteen minutes of actual footage of Lee (he had printed many unsuccessful takes) while the rest had a Lee look-alike, Kim Tai Chung, and Yuen Biao as stunt double. The unused footage Lee had filmed was recovered 22 years later and included in the documentary