DOOM: Death Doesn't Wait is a mod for registered Wolfenstein, made by Z. Franz.
An 8-level demo was released on September 21, 2007 with the full 23-level version coming out one month later. The mod is based entirely on DOOM, with all enemies and graphics originating in that game.
It follows an episodic flow, and the new levels are scattered across the first three episodes.
External links
Download DOOM: Death Doesn't Wait at The Wolfenstein 3D Vault