Twisted Metal: Black is the Playstation 2 chapter of a series of car combat games, created by Incog Inc. In 2003 TM: Black was to have a sequel titled Harbor City, though it was never officially announced and the project was later scrapped.
Details on the Twisted Metal Black 2: Harbor City were revealed in the PlayStation 2 port of Twisted Metal: Head On: Extra Twisted Edition. It was originally planned the levels of Harbor City to be greatly expanded and inter-connected with one another, giving a greater feeling of a single, complete world rather than stand-alone levels. Other than car-combats, Harbor City was going to have human characters in 3rd person, for more “personal” fights.. a bit like a GTA game, but with more emphasis on multiplayer deathmatches.
According to bonus material on Extra Twisted Edition, the project was scrapped because of the deaths of six key developers in a plane crash. However, some claim this to be a hoax as no proof of this happening has arisen from another source. [Infos from Wikipedia]
Four levels of Harbor City, albeit without the interconnection or interactiveness active, were included in TM: Head On, as a bonus feature entitled Twisted Metal: Lost, but those were just a small part of the original game. An upgraded version of the Harbor City concept is currently in development for the PS3 by Eat Sleep Play.
Thanks to Cyrax151 for the contribution! Thanks to Miles for his help in preserving more images from this lost game!