From Sega Retro
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Invaders is a 1972 electro-mechanical space shooter manufactured by Sega. Invaders from outer space traveling in disc-like vehicles at great speed are attacking from unpredictable directions. The Defender (the player) in the command module must be alert and quick to down the fleeting vehicles, as they are only in sight momentarily. When a hit is made, an explosion of fire envelopes the target area. The game utilizes a film-type system complete with projector and sound track.