Bad Blood (known in most international territories as Viper) is a 1994 American action film directed by Tibor Takács, starring Lorenzo Lamas, Frankie Thorn, Hank Cheyne, Joe Son and John P. Ryan.

Like MDP's earlier Joshua Tree, Bad Blood mixes noir with Hong Kong influences, and it shares some personnel with that film.

Unrepentant shyster Franklin Blackstone is ambushed on a parking lot by two mobsters who accuse him of defrauding their organization, with the help of an associate named Ricardo.

Travis has an uneasy reunion with Franklin and their father, who pleads with him to help his younger sibling buy enough time with the mob to reimburse the money he owes, ostensibly $100,000.

The film was written by Neil Ruttenberg, before director Tibor Takacs' frequent collaborator and fellow Canadian Brian Irving took a pass at the screenplay.

[2] Gordon Hessler, who had directed several action films for producer Alan Amiel while the latter worked for Trans World Entertainment in the 1980s, served as second unit director.

[9] In the U.S., Bad Blood was acquired by premium cable channel HBO for broadcast as part of its "World Premiere" lineup of movies (whose name was often not strictly accurate).

"[14] Ballantine Books' Video Movie Guide did not take kindly to the film's intense content, lambasting it as "grotesquely violent", as well as "offensively stupid and gory", before warning its readers: "Don't watch it on a full stomach.

"[15] TV Guide's Robert Pardi deemed the film "[v]iscerally exciting", but found Lamas' efforts to save his "unlikable, manipulative" brother an inappropriate motivation for his character.

He also disagreed with Pardi's criticism, appreciating the contrast between the two brothers, one a hard working blue collar man and the other a suit with a taste for easy money.