One of Zarkon's captains is imprisoned after he takes pity on some slaves. Now he is a slave alongside those he once oppressed. As they work on an alien planet, he is separated from the others and found by a race of natives who live underground. When the Voltron force arrives, they find there is no way to attack without endangering the slaves. They'll have to sneak in, but that's impossible without someone who knows the complex. Can they convince the former captain to help?

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