Icefall: Episodes 1-6 (The Clearsky Chronicles)

A sun-blocking shroud hangs above the planet, trapping the remnants of civilization in a perpetual ice age. Cerebus Command, the rulers of Rhone, the fortress ark preserving Earth's biomes, has controlled mankind with an iron fist since Icefall. But a group of rebels is on the verge of fulfilling a 200-year-old plan to crash an asteroid into Earth, breaking the shroud and bringing back Clearsky. Cerebus must do everything in its power to annihilate the threat—and those behind it—before they lose their power and humanity is destroyed... forever.