The script, worked on at various times by hotshot writers Steven Zaillian ( " Schindler's List " ), David Koepp ( " Jurassic Park " ) and Robert Towne ( " Chinatown " ), has the IMF ( Impossible Missions Force ), led by Jim Phelps ( Jon Voight, in the Peter Graves role ), rigging a counterplot in Prague to stop a Russian spy from swiping a computer disc listing all U . S . undercover agents.
