Descent 3 is Interplay's follow-up to the highly acclaimed Descent franchise.  You are once again cast in the role of the Material Defender.  This time, however, your mission is one of retribution as you battle  virally-infected robots across 17 levels (15 normal plus 2 secret). You  must prove that the head of the PTMC intentionally contaminated the  company's robots with an alien virus.  After your rescue in the stunning  opening cutscene you learn that the PTMC went so far to modify the virus as  well.