 In the original Doom, the player lost all their equipment (except  for a pistol and 50 bullets) at the beginning of every new episode  (for a total of two times). Although no reason was given for this  effective "restart" in every chapter, the concept was carried over  into Doom 3, and the player loses all their equipment (twice), on  the journey to and from Hell. There are also several other holdovers  from the original doom, such as a boss fight that consisted of two  Barons of Hell, toxic sludge, and more.