Once an average planet populated by a race of beings with large screws in their heads, it was seized by the Irken Empire and converted into the Conveyor Belt Planet. A massive system of conveyor belts now encircles the planet used for shipping packages. The Screw Heads are now enslaved and forced to do the work in the package shipping, or else they face the tasors of the Irken guards that now watch over the slaves. In revolt, one of the Screw Heads (Smikka Smikka Smoodoo) switched the addresses on two packages, resulting in Smikka getting zapped and Zim receiving the MegaDoomer instead of deadly defective SIRs
