Doom II RPG is the sequel to Doom RPG, set one year after the first game. While there's not much known about the monster invasion in UAC bases on Mars, another monster invasion happened on Earth's moon. A team of soldiers accompanied by a scientist have ventured to the UAC bases on the Moon to investigate.

Doom II RPG is the sequel to Doom RPG, set one year after the first game. While there's not much known about the monster invasion in UAC bases on Mars, another monster invasion happened on Earth's moon. A team of soldiers accompanied by a scientist have ventured to the UAC bases on the Moon to investigate.