 The story by Philip K. Dick (qv) was originally adapted as a  sequel to _Total Recall (1990)_ (qv) by writers  Ronald Shusett (qv) and Gary Goldman (III) (qv) (later joined by  Robert Goethals (qv)). The setting was changed to Mars with the  Precogs being people mutated by the Martian atmosphere, as  established in the first film. The main character was also changed  to Douglas Quaid, the man played by Arnold Schwarzenegger (qv).  The project eventually fell apart but the writers, who still owned  the rights to the original story, rewrote the script, removing the  elements from "Total Recall". This script was eventually tossed out  when writer Jon Cohen (I) (qv) was hired in 1997 to start the  project over from scratch. The only original element from the early  script which made it to the final film is the sequence in the car  factory, an idea that Steven Spielberg (I) (qv) loved.