The Irken Armada

The Irken Empire has amassed a large fleet of military space craft capable of conquering a planet. These are the ships that make up the large swarms of space vessels seen in episodes. They are always around when the Massive is near by, and whenever an Irken planet is seen. 

Name: Spittle Runner

Spittle Runners are the smallest and most fragile ships of the Irken Fleet, but they also move at lightning speed. They are also the most common Irken ship, and there are usually swarms of them.

Notable moments:

-In the Operation Impending Doom I flashback, Zim crushes a Spittle Runner with his Frontline BattleMech.

-There is a Spittle Runner wreck on Planet Dirt.

-Tak modifies the above wreck into her own ship.

Name: Shuvver

This ship is another common Irken vessel. Underneath its outer shell is a pod configuration not unlike that of Zim's Voot Cruiser.

Notable moments:

-This was the type of ship that was seen at Conventia's Docking Ring, where it had the crew beamed to the planet's surface.

-When the organic sweep of Blorch begins, it is these ships that perform it.

Name: Ripper

This ship isn't as common as the previous two. There's not much to say about it.

Notable moments:

-This was the first ship we see in The Nightmare Begins.

Name: Ring Cutter

This vessel is one of the bigger ones. It is also less seen than the others. Not much to say about it either.

Notable appearances:

none...

Name: Viral Tank

The largest ship of the fleet, the Viral Tank is most likely the most powerful as well. It is a science ship of some sort, though it is still armed for battle.

Notable appearances:

Zim flies by a Viral Tank in the opening credits (the corporate logo is on the back of the ship)

-When Zim arrives at the Great Assigning, he smashes his Voot between two Viral Tanks.