The Lost Levels
Taking place an indeterminate amount of time after the Doom marine slayed the Mother Demon in the original campaign, the beginning of the episode finds the marine stranded outside of Hell with none of his weaponry on a distant vacated UAC base. This occurred through the powers of the Mother Demon's sister, known as the Sister Resurrector, who hoped to stop his campaign against Hell by sending him away.
The episode's ending makes reference to the Slayer Testaments of Doom (2016), implying that the journey of the Doom Slayer has begun:
- MAP34: Plant Ops
- MAP35: Evil Sacrifice
- MAP36: Cold Grounds
- MAP37: Wretched Vats
- MAP38: Thy Glory
- MAP39: Final Judgement (Sister Resurrector is boss)
One additional map is included as a "Fun" level accessible from the Features menu.