I just had to write this in response to garabedian123's ridiculous "review". You complain that the series doesn't line up with the movie, but then you immediately contradict yourself by saying you didn't even watch the movie so it doesn't matter. Make up your mind!
Also, the urSkeks were established as being aliens in the original lore material a long time ago. And the reason why Aughra (NOT "Okra") gave the Skeksis the Crystal was because the Skeksis didn't actually start out as being evil rulers (again, this is established in the original lore material). They only became evil as they grew older and their bodies start to fail them. Seriously, do a bit of research first.
Also, the urSkeks were established as being aliens in the original lore material a long time ago. And the reason why Aughra (NOT "Okra") gave the Skeksis the Crystal was because the Skeksis didn't actually start out as being evil rulers (again, this is established in the original lore material). They only became evil as they grew older and their bodies start to fail them. Seriously, do a bit of research first.