Dangerous Journeys was a roleplaying game created by Gary Gygax, the cocreator of the original Dungeons & Dragons system. The game was originally announced as Dangerous Dimensions but was changed to Dangerous Journeys in response to a threat of a lawsuit from TSR, Inc., the publishers of Dungeons and Dragons, and the company Gygax had cofounded, over objections that the "DD" abbreviation would be too similar to "D&D."^[1]

Created after his departure from TSR, the publication of this series of books by Game Designers' Workshop was met with lawsuits by TSR,^[1][2] which ultimately saw the production of the game system cease.^[1]

The design of the game system addressed many of the perceived flaws and limitations of the older AD&D game system, such as a lack of a skill system and rigid, class-based restrictions on weapons. According to a FAQ on the official Gary Gygax website, the Mythus Fantasy setting for Dangerous Journeys was one of several settings planned for the system.

Several books were produced for the line:

• Mythus, the core rulebook
• Mythus Magick, a compendium of spells and magick items
• The Epic of Aerth, a campaign world book
• Necropolis and the Land of Aegypt, a setting book and adventure module
• Mythus Bestiary - a book of creature and monster statistics, concentrating on animals and beasts both mundane and weird
• Mythus Game Master's Screen, a GM screen and book of charts
• Mythus Prime, a simplified and streamlined version of the Mythus rules

At least one additional game in the Dangerous Journeys series was planned but never published:

• Unhallowed, a game of supernatural horror
• The City of Ascalon, a second setting book was advertised. Ascalon was later published as a standalone RPG product in 2023 by FGG Games, LLC.^[3]

Electronic Arts began to develop a video game version, but it was never completed.

• Casus Belli #72 (Nov 1992)^[4]