The game system had several supplementary publications in print during the 1999–2002 timeframe, including:
- Sourcebooks, devoted to covering the key characters, organizations and technologies of the DC Universe setting. Published volumes were thematically organized (e.g. Superman-related characters in the Metropolis Sourcebook, Batman-related characters in the Gotham City Sourcebook, etc.).
- A series of Daily Planet Guides, sourcebooks designed to resemble travel guide to the fictional settings they detailed, written from the points-of-view of assorted characters known to either live in or regularly visit those backdrops. Published volumes in this line of sourcebooks covered Gotham City and Metropolis.