I'm the Krynn, about to dominate a Drengin planet who is being harassed by other race spies (not mine). I culturally takeover the planet, but the spies stay there despite my Super Spy ability - better yet, I can't counter them. They don't show up in Active Spy lists, but they're affecting those tiles...so I can't get rid of them, even though they're screwing with my new planet :-/
-Sand