File:Quake1.gif Episode 3: Descent into Horror Game Previous Episode Next Episode Levels [Source] Episode 3: Descent into Horror or Descent into Horror is the third of Aftershock for Quake. Being the final Episode of the Single Player campaign, this Episode was intended to be very difficult. The documentation for this Episode specifically warns potential players that this Episode is not intended for novices. It consists of five levels total. All levels were designed by Greg MacMartin.