The game's opening cutscene reveals that the player's mentor and brethren have been captured by demon-possessed Roman soldiers and locked in the deepest Roman catacombs. Being a Catechumen, it is the player's job to delve into the Roman catacombs to free them. With the help of various angels, the player eventually frees his brethren at the end of the game by banishing the leader of the demons, Satan, back into the underworld. Source: Wikipedia, "[en.wikipedia.org/wiki/Catechumen_%28video_game%29 Catechumen (video game)]", available under the CC-BY-SA License.