The planet formally known as Doom and the Earth now share a common enemy---one capable of defeating Voltron in open combat and knocking down any planet that gets in its way. Commander Keith knows exactly who's behind it all, and he's got his prime suspect locked in a small windowless room for the next two hours. If he doesn't crack him, then the guy goes free and everything falls down. So Keith must decide exactly how far he's willing to go to find the truth, and he's got to decide quick. Because their new enemy is closing in on its next target, and even though Arus has endured much in the past, surviving 'Ten Lions' might not be in its future...