Operation Impending Doom II

"Operation Impending Doom II? Zim remembers that of course."

--Su Ji-Hoon, Leaving Ningbo

Operation Impending Doom II was the Irkens' second attempt to take over the universe due to Zim botching the first attempt and killing all of the former Invaders. Of course, because of this Zim was sent far away to Earth, ensuring he wouldn't ruin things the second time around. So far, however, he has still managed to make things more difficult for the Armada (most notably by commandeering the Massive in an Invader Zim episode, "Backseat Drivers from Beyond the Stars," and leaving Mars to fly wildly through space and destroy many Irken vessels in another Invader Zim episode, "Battle of the Planets"). Despite this, plans for Irken galactic conquest gone pretty smoothly, with two planets confirmed as conquered, and three others likely to be conquered (as suggested in another Invader Zim episode, "Planet Jackers").