| SDI | |
|---|---|
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| Developer(s) | Sega |
| Publisher(s) | Sega Activision |
| Platform(s) | Arcade, Amiga, Amstrad CPC, Atari ST, Commodore 64, Master System, ZX Spectrum |
| Release | 1987 |
| Genre(s) | Scrolling shooter |
SDI - Strategic Defense Initiative, or simply titled SDI and sometimes known as Global Defense, is a 1987 horizontally scrolling shooter produced and released internationally in arcades by Sega. It was later ported to home computers and game consoles, some by other companies. Players control a satellite and must destroy enemies by moving a crosshair over them and firing the satellite's weapons.