• Walk of Doom •
Zim has just finished upgrading a navigational chip for Gir. With the chip installed, Gir would be able to find his way home no matter where he is. They purposely lose themselves in the city to try it out. When Zim discovers that Gir left the chip at home, they are lost with no way back. They try a bus, the sun, and various other ways of getting home. I personaly do not remember seeing this episode.