Plot: A nocturnal assault by Tendril demolishes the Earth Corps base, prompting a chase into the depths of the Earth, but even with the help of another Mutore species, the rock-bodied Granites, they are forced to retreat back to the surface. When their budget is summarily cut by Senator Masterson — a crooked politician in Blackthorne Shore's shady pocket — they are approached by Sandra Shore, Blackthorne's sister, who has learned of her brother's sinister plot to liberate Metlar