Irken Ground Vehicles

These vehicles are made for ground assaults.

Name: Frontline BattleMech

Appearances: The Nightmare Begins -- The Trial

This large destructive mech was designed as a first wave assault, rushing into battle and destroying as much as possible. It is heavily armed with gun hands and a large canon on its back. A crew of technicians operate it from the inside.

Zim stole one of these at the beginning of Operation Impending Doom I and used it for a destructive rampage on Irk.

Name: Hunter-destroyer machine

Appearances: Bad, Bad Rubber Piggy

The hunter-destroyer machine is a robot that locks onto its target and kills relentlessly. Zim owned one that he planned to use on Dib. He most likely got it from the Vortians, who have always given Zim stuff.

Name: MegaDoomer Combat Stealth Mech

Appearances: MegaDoomer

A new development in Irken technology, this Vortian designed mech can turn invisible. This is useless, however, as the pilot can still be seen. The MegaDoomer is heavily armed, complete with doom canon. It was most likely designed for Invader usage.

Name: Maim Bot
Appearances: Hobo 13 -- Tak, The Hideous New Girl

This mech is most likely a common weapon used in ground battle. Back when Zim was training on Devastis, he used a Maim Bot against a snack machine, sending the planet into a black out. Zim requested a Maim Bot from the Tallest. 
 

Name: Plasma-armed Battle Tank
Appearances: Hobo 13 -- and possibly The Trial

Zim makes a request for one of these tanks from the Tallest. In the script for the Trial, it mentions Zim piloting a spider/crab tank. It may have been one of these.