The American storyline also changes the identity of 'Red Falcon' from being the name of a terrorist organization to the name of an alien entity. Varies between supplementary materials: the Japanese versions sets the game in the year 2633 on the fictional 'Galuga archipelago' near New Zealand, whereas the manual for the American NES version sets the game during the present in an unnamed South American island. In Contra, the player controls one of two armed military commandos named Bill 'Mad Dog' Rizer and Lance 'Scorpion' Bean, who are sent on a mission to neutralize a terrorist group called the Red Falcon Organization that is planning to take over the Earth.

Several Contra sequels were produced following the original game. The home versions were localized in the PAL region as Gryzor on the various computer formats and as Probotector on the NES, released later. A home version was released for the Nintendo Entertainment System in 1988, along with ports for various computer formats, including the MSX2. Kazuki Muraoka, Hidenori Maezawa, Kiyohiro SadaĬontra, known as Probotector and occasionally Gryzor in Europe and Oceania, is a 1987 run and gun action game developed and published by Konami originally released as a coin-operated arcade game on February 20, 1987. Koji Hiroshita, Shigeharu Umezaki, Shinji Kitamoto. Unfortunately, this game is currently available only in this version. The following emulators are available for this game: NeptunJS (JavaScript), Nesbox (Flash), RetroGames (JS) and vNES (Java).

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