Can someone mega-spoil "Big O" for me?

…y’know, the anime series currently running on the Cartoon Network?

By the time the finale rolled around, did they ever reveal what the big conspiracy was, the cause of the amnesia-causing event, and all that?

Or did it end like The Prisoner—or worse yet, The X-Files—and not really explain anything, while opening up a bunch of new and confusing questions?

Well, thank you for your patience,