Blood is a PC game developed by 3D Realms and Monolith Productions and distributed by GT Interactive. Development was underway at 3D Realms in parallel with a number of other well-known titles. Following the success of Duke Nukem 3D, development progress was made public starting in June 1996 with weekly updates on their website. It was originally scheduled for release in early 1997. On January 22, 1997, a press release announced that all rights had been sold to Monolith so that 3D Realms could focus efforts on Shadow Warrior, another Build engine game slated for release the same year. Released on May 31, 1997, Blood utilized an enhanced version of the Build engine from Ken Silverman which featured the addition of voxels. The game falls in the first-person shooter category, and has an arsenal of weapons ranging from the mundane to the bizarre, numerous enemies and liberal amounts of gore.
The Blood franchise was continued with two official expansion packs titled Plasma Pack (developed by Monolith) and Cryptic Passage (developed by Sunstorm Interactive). Later, the sequel titled Blood II: The Chosen was released on October 31, 1998. In terms of copyrights and ownership, Monolith sold the rights for Blood to GT Interactive. GTI was later acquired by Infogrames which has since been renamed to Atari. In recent years it seems that Warner Bros. Entertainment owns the Blood trademark