Defender put players in charge of a ship sent to protect mankind from wave
after wave of attacking alien forces.
Armed with smart bombs and the ability to use hyperspace to move quickly
around the planet, the player ship must fight against Bombers, Pods, Swarmers,
Baiters, and Landers – that can capture the humanoids and transform them into
deadly and relentless Mutants. Fail to save the humanoids from freefall or
Mutant transformation, and the planet is destroyed.