Eternal Champions: Challenge from the Dark Side is a fighting video game for the Mega-CD/Sega CD. It was published in February 1995 in North America and during the same year in Europe, within the waning days of the platform lifespan and was revered as one of the system's most technically impressive releases. The game was a semi-sequel to the Sega Mega Drive/Genesis game Eternal Champions and was part two of a proposed trilogy of games by Sega that would have cumuluated in a third and final game on the Sega Saturn. Both games were developed by an internal team at Sega named Sega Interactive Development Division and designed by Michael Lantham, a developer with Sega of America from their early days. In North America, the game earned an "M" rating from the Entertainment Software Ratings Board for its graphic violence and gore. In Europe, it earned both a 18+ ELSPA rating and a 15 BBFC rating. It was the first game branded under the Deep Water label, which was employed by Sega of America for games featuring adult content. During the mid-90s, fighting games were rampant in arcades, making Eternal Champions: Challenge from the Dark Side one of the first console-only fighting games.