Organic Sweep

"The Organic Sweep is about to start in process soon. I must've known if it's for real because I saw the nuclear missiles launching to Beijing. I must get home before the nukes could hit my home soon."

--Su Ji-Hoon, War Never Changes

An Organic Sweep is the final part of the Irken Empire's movement against any planet marked for conquest by the Almighty Tallests. After one of the Invaders successfully undermined the defenses of their assigned planet, the ships in the Armada position themselves over the targeted planet and bombard its surface with all of their artillery. The end result is devastating - all life on the surface is exterminated, and any structures, flora or fauna are thoroughly eradicated. In an Invader Zim episode, "Battle of the Planets," Irken ships could be seen burning a massive Irken insignia into the planet of Blorch's surface with lasers. This may or may not be standard procedure in order to "mark their territory" before repurposing the planet itself.

Not all of the motives behind the Organic Sweep have been completely defined (although, according to Invader Skoodge, it is "so that no Irken boot has to come into contact with any unsavory alien filth"), though its main purpose is apparent: to reduce the surface of a conquered planet into flat ground, clearing the way for Irkens to begin terraforming.