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

Built-in demos
This WAD features three built-in demos, of which the third one covers an original Doom level. All require Doom v1.2 to view them. The demo levels are:

Trivia

 * The release package of Cleimos contains a editing utility, called . This will make a copy of DOOM.EXE version 1.2 and then changes the automap level names and end-episode text strings. It then renames the new executable to . It utilizes the DOS extender, a copy of which called  is included.  itself is made with . It will leave  intact.
 * As only works on version 1.2 of  utilizing similar functionality to DeHacked's DoomHack feature a patch, called  was made in 2003 by Miguel Folatelli (myk) to emulate the functionality of the executable.
 * The release package of Cleimos includes the Dshrink utility to compress the SIDEDEFS lump.