Cleimos

Cleimos is a Doom episode replacement mod of nine levels, created by Rand and Steven Phares. It had a sequel made for Doom II, Cleimos 2.

Story
The plot revolves around a mercenary, called "Nuts" Kelton, hired to shut down the corrupted systems of a combat training center belonging to the Cleimos Corporation where the VR holograms somehow took physical life and started killing everybody. It just so happens that the holograms had been designed after the demons from Doom...

Levels

 * E2M1: Advent
 * E2M2: Trapped
 * E2M3: Torment
 * E2M4: Enclave
 * E2M5: Hazard Base
 * E2M6: Veil of Blood
 * E2M7: Annihilation
 * E2M8: The Ungathered
 * E2M9: Command + Control