 Bit Parts tells the stoty of what happens when 2 guys (Shark and Coltrane) who will do or say anything to get into the motion picture business finally get their shot. They are hired to create a severed arm prop for an upcoming big budget studio horror movie. Their only problem is that their boss is demanding absolute realism. After several failed attempts at making a fake arm, they engage in some back-alley "medical research" involving a stolen corpse and a chainsaw. However, it seems that there is still some life left in their cadaver. The cadaver man slips into the van that Shark and Coltrane are using to deliver their new "prop" to the set location, and begins is violent quest to recover his stolen arm.