The Lost Episodes of Doom

The Lost Episodes of Doom is a collection of three eight-level episodes for Doom. It takes place on the Jovian moons Callisto and Io, and Jupiter itself. It was a commercial product and was sold with a 246-page book that details the levels.

Massacre on Callisto
E1M1: UAC Spaceport E1M2: Fusion Power Plant E1M3: Jovian Deuterium Plant E1M4: Jupiter Planetary Control Center E1M5: Weapons Research Center E1M6: Halls of Injustice E1M7: Core of Evil E1M8: Callisto Consecration

The first episode takes place on Callisto, one of Jupiter's moons.

The Killing Fields of Io
E2M1: Io Anomaly E2M2: Io Munitions Works E2M3: Io Toxic Disposal Plant E2M4: Weapons Testing Facility E2M5: Io Training Camp E2M6: Io Military Garrison E2M7: The Draining Pit E2M8: Late For Supper

The second episode takes place on Io, the most vocanically active body in the Solar System.

Hell's Gate-The Red Spot
E3M1: Jovian Stonehenge E3M2: Pillar of Peril E3M3: Subterranean Stoneworks E3M4: Pools of Despair E3M5: The Cat-Skinner Box E3M6: Somber Io Promenade E3M7: Jovian Killjoy E3M8: Jovian Déjà Vu Again

The final episode takes place at Jupiter's Great Red Spot. Realistically, a person would not be able to survive on Jupiter due to its harsh atmospheric conditions and intense gravity and radiation.

Ultimate Doom
There is a well-known bug with the add-on. Since Ultimate Doom demos are not compatible with Doom demos, the add-on would crash if it were ran on Ultimate Doom. The solution is to start the game before the demo starts.