Gun-Nac (ガンナック, Gan-Nakku)[2] is a 1990 scrolling shooter video game developed by Compile for the Nintendo Entertainment System.

The game was released in Japan by Tonkin House on October 5, 1990 and in North America by ASCII Corporation in September 1991.

The player assumes the role of commander Gun-Nac, and throughout eight different levels, fights a host of enemies from a space ship.

This radiation caused ordinary inanimate objects to spring to life, and attack the solar system's residents.

The Galactic Federation, realizing the situation was beyond their control, calls on Commander Gun-Nac, son of the Legendary Xan,[3] to save IOTA Synthetica from the ensuing destruction from this strange cosmic energy.