They said you would sleep for half a millennium -- not an unreasonable length of time, considering you'd be in limited cryogenic suspension. Your body would rest frozen at the planet's nerve center, an underground complex 20 miles beneath the surface. Your brain, they told you, would be wired to a network of computers; your mind would continue to operate at a minimal level, overseeing maintenance of surface-side equilibrium. And you would not awake, so they promised, until your 500 years had elapsed -- barring, of course, the most dire emergency.
Then, and only then, you would be awakened to save your planet by strategically manipulating six robots, each of whom perceives the world differently. But such a catastrophe, you have been assured, could not possibly occur.