Alright I was happily playing along (and losing) in a huge galaxy 9 player map. Stuck out in the center

Suddenly I'm told that one of my planets has an evil vibe going on and that we should remove the colony.

Well I waited a couple of turns, but eventually destroyed the colony and the message "Draginol has been destroyed and the universe breathes safer" appeared.

I tried to reload it, but I didn't get the random event.. some other Civ did.

So I'm curious, what happens when you do get that random event and don't destroy the galaxy? Do the Dread Lords enter the game?