Captain Kirk encounters Klingons and nocturnal creatures known as strangers and the Sun God himself in a journey of incredible suspense. Inside the hollow shell of a strange, remote Planet Kirk and the Enterprise crew discover a planet within a planet, energized by a white dwarf store, a planet like a lost Eden populated by a race of small, gentle, Ferd by pens, a planet Fallen toward a black hole to spectacular Peril an inescapable doom.