Set hundreds of years after the events of the first movie when the world has once again fallen into darkness, "Power of the Dark Crystal" follows the adventures of a mysterious girl made of fire who, together with a Gelfling outcast, steals a shard of the legendary crystal in an attempt to reignite the dying sun that exists at the center of the planet.
Where have I seen this before? Oh yeah: Spartakus and the Sun Beneath the Sea
I'd kill for episodes of that in English...all I've got is the whole series in French.