| Console: | Arcade |
| TV Standard: | Region Not Set |
| Developer(s): | Sega |
| Publisher(s): | Sega |
| Release Date: | 1987-04-01 |
| Players: | 1 |
| Co-op: | No |
| ESRB: | Not Rated |
| Type: | Shooter |
SDI - Strategic Defense Initiative, or simply titled SDI and sometimes known as Global Defense, is a 1987 side-scrolling shoot 'em up arcade game originally produced and released internationally 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.
