A disappointed Uslan then wrote a script titled "Return of the Batman" to give the film industry a better idea of his vision for the film. Uslan later compared its dark tone to that of "", which his script pre-dated by six years. In November 1979, producer Jon Peters and Casablanca FilmWorks, headed by Peter Guber, joined the project. The four producers felt it was best to pattern the film's development after that of "Superman" (1978). Uslan, Melniker and Guber pitched "Batman" to Universal Pictures, but the studio turned it down. The project was publicly announced with a budget of $15 million in July 1980 at the Comic Art Convention in New York. Casablanca FilmWorks was absorbed into PolyGram Pictures in 1980. Guber and Peters left PolyGram Pictures in 1982 and took the "Batman" film rights with them, although PolyGram would retain at least 7.5% of the profits of said rights due to a contractual agreement. Guber and Peters immediately set up shop at Warner Bros., which finally decided to accept "Batman".