Jack Conrad was originally set to direct and write the film, but troubles with the studio forced him to leave the project. In addition
Terence H. Winkless was writing the script at one point, but when his version proved unsatisfactory, he left the production. It eventually fell into the lap of director
Joe Dante who brought on writer
John Sayles, with whom he had previously worked for
Piranha (1978), to write the screenplay.
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