 Lawrence Kasdan (qv) was unavailable as he was working on  _Big Chill, The (1983)_ (qv), so George Lucas (qv) drafted in  Willard Huyck (qv) and Gloria Katz (qv) who had previously  penned _American Graffiti (1973)_ (qv) for him. Lucas deliberately  wanted to go with something with a darker tone as this had served  him well with  _Star Wars: Episode V 