- Released: 1990-
- Developer: Arc System Works
- Genre: Action | Shooter
- Mode(s): Single Player
*Code Name: Viper, originally released as Ningen Heiki Dead Fox (人間兵器デッドフォックス, Ningen Heiki Deddo Fokkusu, lit. "Human Weapon Dead Fox"), is a side-scrolling action game programmed by Arc System Works and released by Capcom in 1990 for the Nintendo Entertainment System. The player takes control of a special forces operative who must combat a drug syndicate in South America.
The player takes the role of Kenny Smith, code name "Viper", an agent of the 98th Special Forces. He is assigned by his commander, Director Jones, to investigate a large drug syndicate that covers all of South America. Smith's objective is to rescue a missing agent in each of the syndicate's seven hideouts and uncover clues of the Syndicate's true mastermind.