Operation Impending Doom II is 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 that 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 Backseat Drivers From Beyond the Stars, and leaving Mars to fly wildly through space and destroy many Irken vessels in Battle of the Planets). Despite this, plans for Irken galactic conquest seem to be going pretty smoothly, with two planets confirmed as conquered, and three others likely to be conquered (as suggested in Planet Jackers).
Had the series not been canceled, there would have been a season finale in which Operation Impending Doom II was put on temporary hold due to Invader Tenn being captured on Meekrob (thanks to the insane SIR units sent to her in Megadoomer by a rebellious slave). All the other Invaders, excluding Zim (though Skoodge fields Zim the information on Tenn's capture), would have been ordered to attempt a rescue by the Almighty Tallest. It can be assumed that afterwards, the Invaders would have gone back to their assigned planets to continue the operation, or the operation would have been permanently called off after Zim discovers the beauty in life on a certain planet.
Operation Impending Doom II is the continuation of Operation Impending Doom, which Zim completely ruined. In Operation Impending Doom II, Invaders (specially picked Irkens) must go to a marked for conquest planet and blend in with the natives, assessing the weaknesses and strengths of the inhabitants.
|Invader||Mission Planet||Mission Status|
|Flobee||Rock Planet||Presumably complete|
|Skutch||Striped Planet||Presumably complete|
|Slacks||Boodie Nen||Still in operation|
|Stink||Spotted Planet||Presumably complete|
|Zim||Earth||Failing; in exile|