E1M10: Sewers (David Calvin secret level Xbox only).E1M9: Military Base (Romero secret level).E1M8: Phobos Anomaly (Petersen and Hall 2 Barons of Hell are bosses).E1M4: Command Control (Romero and Hall).E1M3: Toxin Refinery (Romero exit to secret level).E1M1: Hangar (Romero exit to secret level Xbox only).Fan-made levels utilizing exclusively Episode 1 textures, and emulating Episode 1 play style, are commonly referred to as techbase levels. John Romero did not make any other maps in the original Doom, but authored two maps in Thy Flesh Consumed, the only author who contributed to both Thy Flesh Consumed as well as one of the original three episodes.Д«ecause of Episode 1's singular inclusion in the Doom shareware version, the Episode 1 style levels have become one of the most popular and easily recognizable Doom design themes. The episode takes place in the UAC installations on Phobos, one of the moons of Mars.Дesigned mainly by John Romero (every level was exclusively by him, except E1M4, which was started by Tom Hall, and E1M8, which was also started by Hall but finished by Sandy Petersen), the levels have a unique graphical style characterized by extensive use of STAR textures, large amounts of highly saturated brown and green in general, and a misty, mountainous skyline. Knee-Deep in the Dead is the first episode in Doom/ The Ultimate Doom, and the only episode in the shareware version. The intermission screen with a visual presentation of all the Knee-Deep in the Dead levels.

Knee deep in the dead