 TV versions that aired shortly after the World Trade Center Attack in  September 2001 featured certain alterations to the Libyan terrorists subplot.  When Marty reads aloud his warning letter for Doc, he says "You will be  shot," instead of "You will be shot by terrorists," and the "by terrorists"  area of the letter is digitally erased. The most recent TV airing edits the  scene where Doc is shot by the Lybians as well as the scene where Marty is  almost shot. It just cuts to the scene of Doc running off and Marty diving  into the DeLorean and noticing Doc slain. However when Marty returns to 1985  and witnesses these events reoccuring, the shooting scenes are intact.